Mu amp schematic Thats the reason i want a design with less tubes and more solid state. This connection has always been acknowledged on my site and in the material I have published about the circuit. The mu also varies a lot with plate current, more so than the 12B4 and 6AH4 which are lower and more constant mu. ) I used the following test equipment: Fluke 87 DMM Old GE analog 2kV DC panel meter HP 334A Distortion Analyzer Instek 20MHz Dual trace O-scope Jul 4, 2024 · Follower preamp mu schematics cathode zmiana widerstand elektroda warum functions anybody schematu tego problemów razie. In the schematic above the triode draws 10mA, while the MOSFETs draw 120mA. Topology: single ended class A. Treble Boost, Overdrive, Gain Pedal The Mu-Tron TUBETRON is an op-amp based overdrive effect which can be used as a transparent “clean boost” oras a “tube screamer on steroids”. The MINI MU can run on +/-9V with the included charge pump, eliminating the need for a special power supply or two batteries. On the $1 list too. Fig 1. 1950's Masco Model MU-5 Combo Tube Amp, sounds great-not super loud-volume a touch scratchy, a killer crazy clean-rare amp, dimensions are about 12. It is enough for a triode wired EL84 without NFB. 3. All Categories Bass Bitcrusher Compression Compressor Digital Distortion Envelope Filter Modulation Noise Gate Octave Phaser Power Supply Ring Modulation Speaker Amp Sustain Tremolo Vibrato Boost Buffer Cab Sim Chorus Delay EQ / Filter Flanger Fuzz Overdrive Power Preamp The MINI MU is a compact version of the classic Mutron III envelope filter. However, the 40+ mu 12AV7 family tubes I suggested do offer extra "breathing room" over the mu 33 ECC88. I dropped in a 12au7. Jul 8, 2023 · I am building a mu follower with a 31 tube as v1(lower tube) and 12GN7A pentode as the follower. The DLS Mk I is considered by many to be the best version of the pedal, with subsequent versions being quite different in terms of tonestacks and tweakability. Here is the full amp schematic Nov 20, 2010 · Back in around 1976-77 I bought a Mu-Tron Phasor and used it for years in my various bands. Jan 5, 2022 · 2015-2016, I wanted to hear what these two-stage mu amp circuits sounded like at higher supply voltages, so I built one up on a breadboard—or at least, I tried to. Oct 16, 2022 · The post #6 schematic is most likely running with those mu follower drivers for high power output with 450V B+. ) Upon closer inspection of the mu blaster schematic, Jan 12, 2013 · This amplifier will produce about 60 watts per channel. Sources. The guitar version has been popularized by Jack Orman which he dubbed mini-booster. The DLS circuit utilizes cascaded mu-amps as its foundation, without the use Aug 29, 2012 · The Simple45 that Bigun linked to is the precursor to the TubelabSE, which makes a nice 45 based amp with mosfet followers. amplifier featuring offset-voltage null capability. Yes, I'm purist. In fact if you think you want an 6V6 amp, find a 6L6 amp and build that but set the bias down for the lower powered 6v6 tubes, then you have to option at a later date to re-tube the amp for more power (assumming the transformers are sized for the task. Byrnsy's Reddit post about the base. Schematics: Acoustic: Acoustic B450 B600h Acoustic_165 Acoustic_470_service_manual Jul 31, 2019 · I think I found a schematic I can play around with. Schematic Symbols: To accurately interpret amp schematics, it is essential to be familiar with the various schematic symbols used. I don’t think the circuit needs explanation. 811 is not a good tool for the average audio amp. SIT Mu Follower Amplifier Here is the Common Source SIT Mu Follower amplifier that I have built, similar in topology to the FirstWatt SIT-2. But this is nothing more than the conditions from a previous post with the op-amp for accuracy. Speaker efficiency is also a factor. Or use the equivalent high or low mu triode in a single triode glass envelope. Bandwidth also is pretty fabulous. The pedal has its own unique character but operates as an extension of your amp. I thought about how to emulate this. The last two I mentioned were used as vertical output tubes. " If you're already getting a gain of 28, it will be difficult to get it much higher- the mu is the ceiling, unless you're willing to cascode. The bottom JFET was biased by a gate resistor to ground, and the top JFET was biased by two 10M resistors to half the power supply. The unbuffered mu-amp has a quite high output impedance and is susceptible to loading. 6021 and 5902 or 5639 can make a complete 4 Watt P-P amplifier. There are hundreds of pages of Tube amp information on my library page. an original A/DA Flanger, a Bixonic Expandora, and a Hot Chili Tubester. Could I just tap off -60V from the junction of R128/R129 as in the Bev schematic and divide it down to -30V using a simple volt divider (see R5 & R6 in attached schematic)? I also need to measure the voltage gain from the Orange Amplifier Schematic DHT Mu Follower Pre-section Triode Strapped E80L Output Section. May 28, 2024 · Hoffman Amplifiers Tube Amp Forum, Help with mu-follower repair. Some nearly pocket size amplifiers around using these. This circuit was inspired on the ultra high gain audio amplifier from the National Semi FET Circuit applications. A resistor in line with the VC pot at input helps broaden control and saves from Jun 26, 2020 · If you want to drive the amp with an external active preamp, it would be better I think to use the low mu side. Sep 7, 2009 · No I'm not trying to hijack the thread, 6V6 and 6L6 are so close. Jan 2, 2021 · The Tube Amplifier Schematic Bible Volume 1: Library of Vintage Tube Amps (A-F) (Manufacturers A-F) Amazon. Jul 30, 2018 · 6HZ8 gives you an improved 6CL6 pentode (lower knee voltages, 8 Watt diss) and a Mu 70 triode in the same 9 pin bottle. I noticed this jfet mu amp used to replicate a 12AX7 tube. If the load is modest, the mu follower has much to offer; so much so, in fact, that I regret not adding a mu follower configuration on the SRPP+ PCBs. It uses push-pull parallel because this box has a HIGH rated output: it may have been asked to drive long lines in high-RF fields with heavy line-EQ networks. I heard the F&B at a friend's place many times after that. In this book is the applications note AN-32 which contains the cookbook circuit for the jfet mu-amp circuit, which is the basis for the mini-booster. Morley Sapphire Flanger, Mutron Bi-Phase, MXR 117 Flanger, Ross Phaser. This page contains links to some Valve audio amplifier and other schematic circuit diagrams for free download. I'm not sure if I'm mis-reading the schematic or if since the pin 4s (of both tubes) are attached to the plus side of the heater power supply and the pin 5s are a tied together to ground if this one connection acts against both tubes tied together as one unit. The output tubes don't have individual bias controls nor current measuring (or distributing) cathode resistors. It's certainly better than nothing, I guess. Jul 2, 2004 · pleas comment on my schematic any problems???? should I increase the 150v?? maybe to 200v? I want to use a regulated power supply (VR tubes) so thats why 150 was picked. Any help accepted please for the little monster!! Aug 13, 2024 · Line preamp circuit stage 6v6 tube output schematic low tubes making audio supply transformers power mu circuits autoformer under thomasVacuum tube amp 1626 se # 1 1626 tube filament supply amplifier dc power prologue source generic current1626 darling amplifier ended. A generalized discrete representation is given in Figure \(\PageIndex{2}\). The µ Blaster is a boost/overdrive pedal that is designed to slam the input of an amplifier. In the late 1980's I let a friend "borrow" it, which he apparently took to mean, keep it and move out of state with it. All Categories Bass Bitcrusher Compression Compressor Digital Distortion Envelope Filter Modulation Noise Gate Octave Phaser Power Supply Ring Modulation Speaker Amp Sustain Tremolo Vibrato Guitar Pedals and Effects Boost Buffer Cab Sim Chorus Delay EQ / Filter Flanger Fuzz Jun 2, 2004 · Hi, does somebody have a good 211 / VT4C schematic like Air Tight ATM-211 to recommend ? If it's possible without interstage transformer and 6SN7 input valve. NU MU Stereo Variable Mu® Limiter Compressor Absolute Headphone Amplifier Stingray II Neo-Classic SE/PP 300B Mahi Snapper Neo-Classic 250W Monoblock Nov 28, 2014 · I need some help about this schematic, Its Papa Nelson offer for someone a few month ago but there is no update or interest about it and before someone kill me here a few reason why I want to build this amp : 1. Gamma Network on Input May 17, 1999 · It can drive any kind of power amplifier (such as my Power Follower 99), because it has enough output voltage swing, enough gain (about 30db) and a very low output impedance (about 30 ohms) for driving headphones with an impedance of 200 to 600 ohms. Believe me the right one Well here is the complete schematic is given for preamplifier with power supply! I want to make a clone of the peavey amp fuzz in a pedal. Build an outboard PSU to give the 845 the stupid high voltage it needs, slap some different output transformers on the thing and boom, done and done. Aug 13, 2007 · Both the Grado RA1 and CMoy designs use a basic non-inverting amplifier circuit using an operational amplifier (opamp). The top triode is the active load. Lots of: Accuphase • Acoustic Research • Adcom • Aiko • Akai • Altec Lansing • Ampex • Arcam • Audio Note • Audio Research • BK Components • B&O • Blaupunkt • Bogen • Bose • Braun • Bryston • Cambridge Audio • Carver • CEC • Classe • Conrad Johnson • Craftsmen • Creek • Crest • Crown • Cyrus • DBX • Denon • Dual • Dynaco • Dynacord Take your 300b amp and stick a 845 in after the 300b. OPAMPs usually have low output impedance as they are used as amplifiers so Feb 14, 2011 · Just give me a schematic to start!!I'm horrible to this part!! I prefer to drive the tube with a mosfet. The mu-follower will clip hard when overdriven, producing a rich spectrum of both odd and even harmonics. Now, push into the bjt_pkg circuit in the new schematic amp_LNA. Jun 26, 2017 · For a proper µ-amp, check out this issue of Tube Cad: The first article goes into the SRPP (shunt regulated push-pull, another name for µ-amp) and shows how to design it with tubes. We have a vast technical library and can offer you xeroxed copies of schematics (and some service manuals). Input stage / pre-amplifier: resistive loaded common cathode with 5687 triode Title: 211 Author: RCA Subject: JA-FP-2002-06-14 Created Date: 6/15/2002 1:18:08 AM Jun 2, 2019 · -Use a lower mU phase-splitter. If you need a guitar amp schematic for your amp repair that is not listed here, contact us and we'll try to locate it. Due to the reasons given in the Kimmel paper, the mu of the bottom tube is used to its fullest extent practical. Cathode follower single schematic amplifier ended amplifiers deliver each here tubeBrains & brawn cathode follower Cathode follower calculatorCathode-follower power. My question is the cap that goes from the gate to the source on the top JFet circles on the pic, does that have any effect on tone or is it just to stabilize the jFet? Trying to figure out what different values here would do. The output impedance is really low with a MOSFET on top, compared to a tube. Feb 14, 2011 · -Further I will strongly suggest to you to go with DC coupled CF driver stages , bipolar supplied , and I think that standard EL84(2x) tube triode connected can do the nice job , in this context check schematic from that old Philips EL6471 - 1KW amp , If I remember correctly there two EL34 drives two tetrode QB3,5/750 DC coupled . Volume: This control adjusts the output volume of the pedal. 811 is suited for Class C RF amplifiers. Orman, but also this circuit board will accommodate many variations. DT All just for fun! It was published in February 1973 and I bought it in 1976 (for $1. And I think you meant to mention "Unity Coupled" is the original McIntosh wiring. Apr 14, 2014 · The Dynaco Dynakit Mark III amplifier is rated at 60 Watts. I've read that some include a bias control to be able to control the gain of this configuration and control the amount of gain/grit this circuit would output. Firstly, thanks for the website and the various amp designs, really appreciate the designs and all the info. a controller for the Chroma that would enable the user Jun 4, 2004 · Google for fender amp schematics check places like the blue guitar site check ampage. Schematic for the amplifier, omitting power supply II. Leeds Fuzz. According to the datasheet, the package is rated at 500W dissipation, but the SOA is not specified. I know that will not be a good amp in the ears. Accurate matching is not a must, however in my sims I found that mismatch changes the upper and lower clipping level a bit, so the upper JFET biasing might need some adjustment around Vcc/2 if you desire clipping symmetry. This schematic shows slightly different input voltages vs original. Aron Nelson then added a Big Muff-style tone stack to the Mini-Booster, which became the basis for the Apr 1, 2018 · Here is amp schematic as my original posting may disappear. This uses two identical JFETs. Schematics. Of course it must run in pure class A. I just chose the 47ish values according to some circuits that utilize this kind of thing (C***inbread SFT II for example). Factory Service Manuals with Schematics: Admiral; Airline; AMP AS6 AS8 AS10 AS-18 AS36 Audiosphere 27 CAM10 CAM5 CM10 This application, a small OTL power amplifier of sorts, forced me to concentrate on delivering power. Oscillations would be a health risk for tinnitus in a head amp. 7kΩ 100µF 183kΩ 0. Mar 30, 2006 · I just saw a schematic of the Western Electric KS-16617 amplifier and noticed it includes a single-ended compressor internally and just wanted to share it here. relative permeability is the key data. As the signal amp and control amp is one and the same thing, they use a multitapped output transformer in order to feed a reduced level to the rectifier for the lower compression ratios. I need an amp for 2 X 10" (RCF L10-750YK) with @ 350w so total 700w RMS 2. It was used very successfully in the driver stage of the famous Quad II amplifier. May 27, 2011 · Bogen DB15 schematic. This is a good simple design that will provide 12 watts. Can someone provide schematics/more information about this please? Actually "Class A" was assigned to the mu-amp by National Semiconductor back when this circuit first appeared in their application notes many decades ago. A vertical amplifier in a TV set is basically a class A power amplifier and has to be very linear so as not to compress or expand the picture at the extreme top and bottom May 22, 2022 · The generic op amp consists of three main functional stages. Fig 3. Symbolic representations of components such as resistors, capacitors, and transistors help technicians identify and understand their functions within the circuit. With only one stage you can drive the GM-70 to full power and get 18W out of this lovely transmitting valve: GM70 SE Amp. Be prepared for some creative circuitry. Top. But not everyone needs to deliver huge current swings in to low-impedance loads. 6SN7 / 300B Single-Ended Triode (SET) Tube Amplifier Masco PA Schematics for Tube Amplifiers. You will like the results. The development of Feb 11, 2006 · EV4417 6cm5 (6x) P-P Amp Schematic Hi, I have recently acquired 4 EV4417 amplifiers which I think are Philips brand. I would search for for some schematics that either use a 12AY7 or 6072 (almost identical). Jan 12, 2009 · I would not waste time building something from this schematic. In the Main window, create a new project named: amplifier. Jan 29, 2019 · So, when using a mu of 4 2A3, it requires a mu of 100 12AX7 or mu of 100 12BZ7 to have an ideal sounding amplification ( four times one hundred = 400 ) as a two stage amp. Photos of his build are shown below and additional information is available on the forum in the First DIY amp FINISHED - 300B SET - works! thread. (See the amp circuit in Fig. Nov 20, 2024 · Amplifier 6sn7 simpler could made tubecad Cathode follower schematic circuit features click diagram description below special Je labs arkiv (up to 2008): je labs phono and line preamp Srpp tube amplifier 3, test with 6sn7, output impedance=worse than QuoteB) Mu-cascade (AKA Mu-amp). Go back to the mixer project and open the schematic: ckt_env_mixer. BTW- output transformer must have at least 8K plate to plate impedance. Originally created to get extra amplification out of Jun 22, 2007 · The SRPP circuit has also been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode Follower. The final build completed at Mu was the roof of the Nether hub, designed by l_amp. In this guitar amp you have copied, we have a mu of 100 times 12AX7, into a mu of 19 times EL84. With over thousands of schematics from various brands and models, the Guitar Amp Schematics Archive is a one-stop shop for anyone looking to delve into the world of amplifier construction. PRE ANALYSIS / DESIGN A. General Electric A1-300 power amp. Since the op amp requires a differential input scheme, the first stage is most often a differential Jan 20, 2019 · So checking out the schematic posted below. for other schematics Lots of stuff on the web. But will be a good to the eye and "i have done that!!!" amplifier. Here's the Cat'bread SFT (posted at Thermionic Studios): Oct 6, 2011 · One of the most famous pre-amps for guitar use is the mu-amp. )-Use a lower mU voltage amp. The 2SK182ES SITs are capable of disipating considerable power. The original name for this circuit is a Balanced Direct and Alternating Current Amplifier (Maurice Artzt, Radio Corporation of America, February 9, 1943, Patent 2310342). PS, if anyone knows where I can get a better copy of the so-called MC275 CE aka Gordon Gow edition, let me know. Telephone: 410-788-2323 Email: info@musysic. Front end is a K2-X op-amp. EB, Custom Amp 60, 60W top. I’ve tried other configurations for the first stage, such as a mu follower, SRPP, constant current sources, even a pentode, and they don’t make it sound better and just add complexity. 4/15/00: Free download - PCB layout for the Mini-Tubes 2 Preamp You can also build a Mini-Tubes I on the same layout!! 3/16/00: Soft Power On Tester for Amps: 3/14/00: Making Repro Vox Dust Covers: 2/18/00 Analog Man Bad Bob Booster, originally by Robbie Wallace In 2010 Analog Man started to build these ourselves after taking them over from Robbie. It can deliver Mar 23, 2006 · I tend to think of the 12SN7 as an octal form of the 12AU7 - a high power low mu dual triode. This preamplifier in combination with F5-audio amplifier gives the true audiophile sound. Here are some variations on the JFET Mu amp booster made famous by Jack Orman at amzfx. 6DJ8 / ECC88 SRPP Tube Preamplifier Schematic Oct 30, 2022 · Hi, I'm fairly new to the AMZ Mini Booser (which uses a Mu Amp configuration). Mu-Tron C-200 Vol-Wah Pedal Schematic Contents: Schematics, Product Picture / Illustration, Controls, Functions & Theory of Operation, Interconnection Diagram, PC Board Layout, Parts List, Semiconductor Generic Reference Numbers, Service Bulletins / Engineering Changes / Modifications (Dated 1979) ($20) Masco Mu5 Amplifier Schematic - Free download as PDF File (. In North America, 5965s are INEXPENSIVE, but I can't say anything about UK cost. com $25. See Buyanalogman. A real op amp may contain more than three distinct stages, but can be reduced to this level for analysis. The Quad II pre-amp and power amp. b. My question is Jun 22, 2007 · The SRPP circuit has also been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode Follower. That, after all, is the definition of a current source. Welcome To the Hoffman Amplifiers Forum January 12, 2025, 08:44:44 am I found a schematic online Schematics, circuits, PCBs and veroboards for guitar effects pedals. We're available to take your call between 10am to 4pm EST. Dynaco Dynakit Mark III Tube Amplifier Schematic a. The mu-follower is a high gain, low output impedance inverting stage with excellent PSRR and very low non-linear distortion; making it enormously popular for hifi. More information about tube based power supplies is available in the Power Supply Design for Vacuum Tube Amplifiers article. Schematic. Blackout. It uses a single 6BA6 pentode cap coupled to half 12AT7 and SE transformer coupled as output. E-Mu Drumulator Drum Machine Service Manual Contents: Schematics, Specifications, Controls, Functions & Theory of Operation, Test Procedures, Technical Circuit Descriptions, Timing Diagrams, Block Diagram / Signal Flow, Test Modes / Functional Testing, Service Bulletins / Engineering Changes / Modifications (Dated 1983-84) (79pages/$40) Mar 13, 2018 · I keep getting requests about SE amp designs using the 6SF5 driver. 50. Also corrected value of R7 and fixed spelling of DCC90 name for V1 tube in version Downloadable PDF service manuals, repair manuals, schematics, parts lists, circuit diagrams, disassembly, troubleshooting and service menu guides for hundreds of electronics brands. If you have any questions for us, give us a call or send us an email. The triode tube has two sections, and one is used for each channel. 9/24/98: Added Rin to both amplifier schematics (figures 3a and 3b) and removed 6VDC output from slow-start power supply schematic (figure 7). Please visit my Tube Amplifier Forum Here's the place you can go to ask tube amplifier questions. Note the very sturdy parallel-cathode-follower output (the 12AU7 section). +30dBm was routine on somewhat beefier broadcast limiters. Jan 21, 2025 · I can't count the number of websites that use the two terms SRPP and mu-follower interchangeably. Jun 30, 2009 · After looking at a few vari mu compressor schematics I mostly see the same concept where the push pull output pentode's anodes get fed to the rectifier and then fed back to center point between the cathodes of the input valves. But if you use either a 7247, 12AX7, or 12AU7 (or their dual triode equivalents), it would be best to only light the side you are using. Dec 17, 2023 · Hello from England. We added a UL tap with the Edcor output transformer, and modified the feedback with a cap. Factory Service Manuals with Schematics: Admiral; B 20 AMP BB1A BIB1 BP60 BT12 BT25 C-100 C-15 CX-15 CX-70 D-10 D-100 D12 Apr 13, 2006 · Mu follower calculations are treated in good detail in Morgan Jones's "Valve Amplifiers. In this book is the applications note AN-32 which contains the cookbook circuit for the jfet mu-amp circuit, which is the basis for the mini-booster. Accordingly, I wanted to see how much "credit" to give the mu-follower circuit, so I adapted the circuit for 7591s and Sansui OPTs. harkonen (Croatia) and made an excellent audiophile preamp with tube/valve ECC88 . The schematic above shows the integrated version of the Carmen amplifier. Feb 15, 2006 · An ECC88 section probably has enough gain to achieve full power driving the EL84. The BSIAB was originally created by Ed Guidry in 2001 as a modified version of Jack Orman's Mini-Booster. I am trying to understand the 12GN7A pentode operating point. I’d prefer the original schematic in case I missed some important detail 25 years ago! I recently purchased a pdf copy of the Audio Express May 2019 issue hoping The Mu Stage Update by Alan Kimmel may include a schematic of the original design but it did not. The reasoning was because the lower fet is what is actually driving the load. Unlike many manufacturers today in the past. Offtopia's video of the base Apr 29, 2015 · The preamp design is straightforward, using EL34 pentodes wired as CCSs as the plate load for the low-mu triode. I’m relatively new to reading schematics (I’ll include the link to the full amp schematic also. I absolutely loved Komo's amp. This is the main factor for primary inductance. Because of the lack of even good bass performances, the measurements of transfer of the amplifier is Schematic. it's for a projector the only thing is I do not know the plate voltage on the tube which I'm guessing from the datasheet is around 230-210v and I would need to add a linestage amp because the crystal phono cartridges of the day drove at 3v I believe so I would need to use another 76 tube I Masco Mu5 Amplifier Schematic - Free download as PDF File (. V2 is an amplifier. This is a great review of the kind of sound you can expect from a Masco MU-5. Sep 6, 2014 · Stephen (sampleaccurate on the forum) put together a 300B SET amplifier following the above direct-coupled 6SN7 driver / 300B SE amplifier schematic. A DIY hi fi preamp design from 1954. Schematics, circuits, PCBs and veroboards for guitar effects pedals. com for more info on our versions, exactly the same circuit as Robbie designed and built, using the same FET testing and sorting procedures. This started about 10 years ago while looking for a way to get triode like performance from TV sweep (line output) tubes without blasting their screen grids. The Horizon Amp Overdrive is a faithful recreation of the Catalinbread Dirty Little Secret Mk I, which is known for its amp-like response and Marshall flavor. Now, click: Save As and save the schematic in the networks directory of the new amplifier project, giving it the name: amp_LNA. Actually this is the crucial poit (with internal resistnce of the tube) for any SE amp. May 5, 2010 · The link doesn't show the buffer. Mar 30, 2015 · The Complete Amplifier After powering the amp up for the first time (Photo 5), I made measurements to verify operating points and such. The ones shown in the pictures below are without the 5687 input stage, and therefore made it a low to medium gain power amplifier. Let's hear comments from the people who enjoy this particular dish! On today's menu, the Feral Eye 2A3 PP Jun 25, 2023 · At the end of the day there are virtually no balanced tube amp schematics out there that I can find. (Recreational breadboarding after a long day of work and classes is, perhaps, not the most rigorous discipline. 1943, US patent 2,310,342. I've studied Alan Kimmel's pdfs and looked at Triode Dick's designs. They were rack mount amplifiers from a cinema that were removed (still working) 10 years ago. com The Plexus Amp Overdrive is a pedal that is based on the Brown Sound in a Box (BSIAB) design, which is known for its ability to recreate the iconic "brown sound" made famous by Van Halen. Ampeg Schematics Carvin Schematics Crate Schematics Fender Schematics Garnet Schematics Laney Schematics Marshall Schematics Matchless Schematics Mesa Boogie Schematics Nov 18, 2017 · I ran into problems with a 27 preamp (Emotive Erato) when I used it with a power amp that has unusually high gain, but the preamp was very quiet when I used it with a low-sensitivity 2-stage power amp. 2 and the parts list in Table 2. More importantly, the cathode resistor value is no longer a hair-trigger mess. People never like to hear this, but with high probability, over 90%, it's the same causes: incorrect component pinout, incorrect component orientation, incorrect component value, flakey solder joints, mistaken wiring. Care should be taken with high gain tubes to avoid oscillations - grid stoppers, ferrite beads etc. I simulated the RIAA-corrector and it's response is within + 0,3 dB compared to standard RIAA curve. 5K. Jun 27, 2021 · This is an SE amp I designed to use the very linear 6SQ7 high gain tube as a driver, built with some Edcor 15W 3. Jan 1, 2012 · Tech Talk - Masco MU-5 Older tube amps made in the 40's and 50's make terrific blues guitar and harmonica amps. It could also be DC coupled with a cathode follower and taking the +/-300V op-amp supplies negative by 85V (or the cathode follower drop plus the proposed bias for the GU-81). ) Jun 3, 2005 · 5902 push-pull amp from Italy Folks, If I may add a link on 5902 amplifiers: there is a push-pull amplifier project posted on the "Radio di Sophie" site, run by Italian hobbyists. sony mu-a151 mu-a301 professional power amplifier service manual including printed circuit boards, schematic diagrams, and parts list 21 pages in english this is a pdf file available as an immediate download, a link will be provided right after payment is made ( if you miss that the link is also in an email we send r Jul 12, 2019 · First, I heard both the original "Flesh and Blood" amp and Komoru's all-DC-coupled SE 300B amp at the Fi store in NYC, back in the day. This could probably drive a 10K load pretty easily. May 21, 2020 · 811 Mu is extremely high, but the plate resistance is extremely high too. Maybe there are more ways to vari mu? not sure, but I see a Since "Mu Amps" (in this case, I guess, the "real" version thanks to the 1k R4 in the correct position) have LOADS of gain, a bit of Local Negative Feedback seemed to be in order (R5 & C5 in my schematic). 5" by 10" by 7", very nice condition. Jul 2, 2012 · I combined with the schematic "Line ubava stage" of Mr. Compare the "Mini-Booster" to the mu amp in the article. The Tube amp Library of information Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips. In some cases where the output is a resistive load, a buffer is used. 99 GeekLJT Radio Audio Soldering Kit, Blûêtoöth-Compatible LED Speaker Soldering Project, FṂ Radio DIY Electronic Kit, DIY Soldering Kit for College High School Education GeekLJT Feb 22, 2024 · Is it because the mu follower gives an active load to the input tube, or because the amp has low global negative feedback? Or maybe a combination of both, along with the fantastic Dynaco OPT iron? I can't say for sure. Very simple stereo amplifier circuit , with only n 1500W Stereo Power Amplifier Schematic; 1400W audio power amplifier; 140W Amplifier Circuit ( 2x 70 Watt ) 150 watts power amplifier circuit; 12-Volt to 32-Volt CT converter DC to DC; 150W amplifier with active crossover; 15Volt Amplifier Circuit Diagrams; 15-Volt Stabilizer circuit Polytone 378 (lm391, 2n5880, 5882) Power Amp Schematic Polytone Bass Preamp Schematic Polytone Mini Brute Preamp Schematic Polytone Preamp Mega Brute & Mini Brutes I – Iv Polytone Wiring Diagram: 378b Power Amp Sch Polytone 110w Power Amp (models 101, 104, 212-300, 215-300) Schematic (1) Polytone 378 Power Amp Schematic Jun 24, 2004 · There is this other compressor, UA177 I think, which has variable compression rate. A single NPN transistor (if that's the buffer) may or may not be good enough to buffer it. 300bs are pretty common driver tubes for the 845. Schematic Page 1: (Audio amp) The first stage is a common cathode voltage amplifier. I have built a prototype (single channel) of Nicola del Ciotto's amplifier and it sounds good, but needs a preamp capable of providing 10V RMS output (or more). Feb 23, 2021 · wind up using 12AX7's over the 6DJ8's since they are higher mu and the 12GN7's. The input capacitance due to miller effect is very high and causes loading of the cartridge which cause a rollercoaster frequency response with many if not I did some actual measurements you see in the schematic. The device is short-circuit protected and the internal frequency compensation ensures stability without external components. Sep 16, 2023 · This area was known as Mu Landing, and represented these three groups coming together to base at Mu. this stage will drive a E80L triode strapped. The TUBETRON utilizes Mu-Tron’s patented opto-mod technology to create a“push-pull” type of parametric tone stack. Look for flat impedance curves, which help maximize this amp’s potential, especially if the speaker lacks big capacitive phase angles that correlate with low impedance. I have built the lacewood V1 exactly as specified with the exception of using the 370 series transformer for UK voltage and also Edcor 15-8-5 OP transformers rather than 10w as I had them from a different project. Seems to work fine here, and sounds good, but the gain is only reduced by a couple db. c. org etc. We call it Jack of all Mini-Boosters , mostly as a tribute to Mr. The schematic I use is this one (It's the MKII): Stomp Box Schematics. Feb 14, 2011 · Just a quick sketch. Being in the music repair business for over 20 years has enabled us to own a great deal of information from before the beginning of midi keyboards and we have a large number of those keyboard schematics on hand. Jun 4, 2004 · The Tube Amplifier Schematic Bible Volume 1: Library of Vintage Tube Amps (A-F) (Manufacturers A-F) Amazon. To first test the amp use lower output single coils and no pedals, (guitar to amp) this is more for how it was designed I would guess. Imgur album and history of the base. There are many good solutions in the DIY community, but nothing seemed satisfactory to me. I have some, but I would like to have opinion those which used these valve and to share their experiment Thanks. You will need a capacitor at the input ~ 0. I answered my own question While I thank everyone for showing Triode-Pentode, UL-Pentode and/or Triode-UL wiring, I had asked for was a Triode-UL-Pentode switch. Two tubes makes a complete 8 or 10 Watt P-P amplifier. Other pre-amp schematics I've seen do not tie anything to pin 9. With schematic design I foreknew only the one thing: it must be Single–Ended Direct–Heated Triode Amplifier. 6DJ8 / ECC88 SRPP Tube Preamplifier Schematic Mar 21, 2020 · I used a 6N30 but plenty of alternatives for a mu of 1K to 2. The Valve Wizard -Mu Follower For starters keep it simple try the circuit in post number 3. pdf) or read online for free. Just what Jan 4, 2013 · Since starting to research 2A3 SET designs, several sources have also mentioned that 2A3 PP is also very sweet. If you link me to a schematic or something similar that makes it easier. The driver is described on the 6SF5 blog post. Bogen PA Schematics for Tube Amplifiers. Dec 5, 2016 · "Dirt Cheap SE" -- 6BM8 amp Hi, again, Here is the schematic for a 6BM8 SE amp based on the Mullard ECL82 idea. It consists of a differential input stage followed by a second gain stage. I'm looking for comments here particularly other examples of tube amp balanced inputs. The controls on the µ Blaster are as follows: 1. . (I know I should probably adjust the working point if I decide to keep the 12au7 here. The high common-mode input voltage range and the absence of latch-up make the amplifier ideal for voltage-follower applications. I sometimes gig with an amp that uses a 6SN7 in Push-Pull as the output tube. V4 V5 is a power output stage. The Leak TL-10 amplifier. The Input Network The input to the amplifier uses a resistive gamma network. It drives to full power without a pre-amp, which works great with my EAR 834 clone phono stage or straight from a CD deck. Note that on the EL34 CCSs, the screen grid is bypassed by a large capacitor to the cathode of the tube. With 180V, it's possible as long as you don't need gobs of swing. 4/19/00: The FX Bus. com $17. 022µF 470kΩ 500Ω 250µF 8Ω 12AX7 6V6 Fig 2. to ground to produce a cutoff at a couple hundred KHz. 60) when I was working in electronics repair. 5k OT, to a UL tapped EL34. Neumann PV15 Isolation Amplifier Neumann PV46 Line Amplifier Neumann W444 active fader module Neumann 472 Isolation amplifier Neumann 482 Distribution amplifier Neumann V475 Mixbus amplifiers Neumann WE66 RIAA playback equalizer Bridged attenuators layout NTP paper describing NTP 179-120, 179-160, 179-230, 179-400, 182-100, 182-200, and old The result is a further linearizing of the MOSFETs, but a diminution of total transconductance, which helps explain why the current-sense resistor, Rak, is now a big 15 ohms in value. Something to do with low-mu triodes in PP. The most popular approach for CMOS OPAMPs has been the two-stage architecture. That design will need matched tubes to distribute the plate currents evenly. This amp sounds fantastic and is a simple/cheap design to build. This deviates from the one-JFET-per-tube concept, being more akin to one mu-amp per tube. Figure 1. It features an active clean gain stage and an additional "in between" position on the range switch. May 3, 2021 · The plate to grid feedback can be adjusted to make a linear low Mu triode from a higher Mu triode. Good luck. Here is what I have come up with for the 6SF5 driving the GM-70. Mar 3, 2005 · V1 is an amplifier. As originally used, the mu-amp/minibooster was two N-channel JFETs stacked from a positive power supply to ground. I thought Komoru's amp sounded much better. The 12AY7 is a wonderful tube it has a mu of ~40 and has been used in high-end products from tube condensor microphones to microphone preamps and more. Pascal. Of course the preamp volume control was turned up higher with the low-sensitivity amp. The schematic for the amplifier is shown in Figure 1. It retains the same fat and funky filter sweeps but in a smaller enclosure. recommendations for power supply??? dunno about SS, hybrid or tube rectified. This amp loves a tube-friendly loudspeaker. The design can only be approximate because the cathode resistor of the upper tube stage should be the reciprocal of the transconductance. Jan 12, 2025 · The circuit looks fully OK to me. We are always adding more as we find them so check back often. 14V Rod Coleman Regulator and PSUs Taken from: Digi-Key Part Number Jan 25, 2008 · As I have researched this subject I have found that higher mu valves like the 6SL7 and 12AX7, especially used in such a simple circuit, do not lend themselves that well to this function. For my CMoy, the opamp used was a OPA2132PA (Burr-Brown) which retails for about $5 and for the Grado RA1 uses a JR4556 that retails for about $0. Jul 8, 2021 · A lot of amp-sims use mu-amp configurations of the JFET, for instance a lot of Catalinbread's AIAB circuits, as well as other brands. 47 uf. ) I’m wondering how I could make this into a pedal? I’m assuming the first stage is the fuzz and the second after the blend is a clipping/boost section. This is the only efficient way to get pure sounded amplifier. unless I'm missing something. A low-value potentiometer may be May 5, 2022 · The original build is still intact but I don’t wish to reverse engineer. 99 Soldering Iron Kit, 60W Soldering Iron Adjustable Temperature 25-in-1, 5 Solder Tips, Solder Wire, Desoldering Pump, Wire Cutter, Heatshrink Tubes Welding Kit for Electronics Repair Hobby 110V US Plug Tanovedio Oct 15, 1998 · 9/22/98: Added version 2 of amplifier schematic (figure 3b) and revised power supply schematics (figures 4, 5, 6 and 7). Then there are the sub-mini tubes. And that is for proper measurements in LF. Beam power tubes, that's the reason for the UNSET's existence. Tubelab sells the PCB's and if you pick up a power transformer with several secondary taps, you can build/modify the design to run 45's, 2A3's, or 300B's. I found the F&B kind of 'thin' sounding. 10K is best as shown on this later schematic. The schematic for one channel of the headphone amplifier is shown in figure 1. Today we look at a transistor arrangement that results in very large amplification factors: the mu-amp. Jan 24, 2014 · I'm building a 300b se amp at the moment, my preference is for high gm/mu triod wired pentodes D3a/ef184/6j9/6j52 two stage amp or if your using a tube preamp 4p1l or other dh tube two stage both with gyrator loading, over the 6sn7 which imho can have a more coloured sound. The Guitar Amp Schematics Archive is a valuable resource for guitarists, amp builders, and enthusiasts alike. V3 is an amplifier. High level block diagram of the amplifier Signal +300V +300V 1MΩ 27kΩ 2. Regards, KM Sep 8, 2015 · Updated FX Bus with a Buffer/Gain/Booster module, a JFET Mu-Amp layout, and a Tube Amp Style Tone Control module. They have a mu-metal mounted transformer on the input, a 12AX7 driver tube and 6 6CM5 (aka EL36) pentodes in push pull for the output. Here's an example from the Tube Cad Journal: "This circuit has many names: SRPP, SEPP, Totem Pole, Mu Follower, Mu amplifier, Cascoded Cathode Follower, and its original name, the Series-Balanced amplifier (Feb. Germanium Boost. That does not means a lot. Nov 25, 2010 · A Mu-Follower is a example of a classic actively loaded common cathode amplifier. I have also used hi-mu triodes, but 6N2P-EV tubes with practically similar topology and the results are good. 811 is suited for audio class B amplifiers with negative feedback. It converts a 9V power supply to about 27V, providing more headroom than other similar pedals. The power supply uses a GZ34 tube rectifier and C-L-C filtering. Jun 21, 2017 · The only thing this amplifier lacks is high output power, so 90dB/watt speakers (or better) will be needed to compensate. Jan 17, 2012 · Now there are several schematics available for the Zvex Super Hard On as it's circuit has changed slightly over time. The book says an ECC812 mu = 50. uaxvh oxmje tftv ixavah udnzdzf uunibr xjhu vkxc qwzel wki