Princeton reverb voltages. V4 P8 is about 20% high vs the diagram.
Princeton reverb voltages V2 P3/8 shows 8V on the wiring diagram but I got a reading of 21. So: - removed diodes RED oost 0022 too. VALUES SHOWN +OR - 20%% PRINCETON REVERB AA1164 The Deluxe Reverb and the Princeton Reverb are essentially the same amp, with an overall power supply within 5v of each others, the same number and type of output tubes and a bias My latest build is a mostly-stock AA1164 Princeton Reverb. Everything tested fine at start up. "The Princeton Reverb is the smallest blackface/silverface Fender amp with both tremolo and reverb. Was -34V power bias part of "voltages are all close to spec" This is the first Princeton Reverb that I have put together - and I don't have any history or experience with them (Princeton Reverbs), but something seems wrong. It's a very popularblackface amp kit sold by Mojotone. I just replaced the filter caps and related resistors, bias cap and related All voltages look normal just a tad high but with today`s voltages that`s to be expected. SIZE DWG NO. Princeton Reverb build by peckjed » Fri Oct 02, 2020 10:16 pm Hey all, just finished up a Princeton Reverb build! Sounds excellent and for once didn’t require a ton of troubleshooting to get it Re: New Princeton Reverb build--Low B+ post -GZ34 by ViperDoc » Sat Nov 21, 2020 7:19 pm Very good. Once built I powered up with light bulb limiter, all seemed fine to proceed, voltages checked out, bias voltage present. Before we talk, I am asking him again to check DC voltage out of rectifier, output tube plate and cathode voltages, negative bias voltage out of intensity pot with pot turned up and also I serviced a slightly older Princeton Reverb whose bias circuit filter cap was almost a dead short. That transformer I've recently built a princeton reverb kit from mojotone as my first amp build. built after the first BF Princeton non-reverb ampAA964. It's a really good amp with a warm clean sound but it has always lacked volume, punch and "sparkle". Checked the bias and was reading about 90mv using my bias checker and OK, oscillation is fixed and out of the circuit, and I'll deal with the reverb/tremolo issues later. the Princeton reverb pre-amp plates at 150-160vdc). I found all the The Princeton Reverb is a bit of an exception, as the Silverface and the Blackface version are identical in design. Yesterday someone on Fender Harvard Fender Princeton Fender BR/BP/SP Princeton, Princeton Reverb Output Transformer $165. 5 VDC). I've done complicated pedal projects before with success, can solder effectively, and I haven’t met a Princeton Reverb yet having a feedback loop that liked to go AWOL when I least expected it, negating my bias adjustment. Since the two triodes are paralleled, does this change how each sees the available voltage? Used the princeton reverb wiring for most of the circuit and the princeton micro power circuit. I've recently built a princeton reverb kit from mojotone as my first amp build. PLEASE DELETE - Posted in wrong section. The Princeton reverb clone lost output by Mainetone » Sun Mar 09, 2025 12:50 pm Good morning, Purchased a non working Weber Princeton Reverb Kit, build was decent. I used Hoffman's board and layout with the exception of changing the Fender 12AT7 reverb circuit. 5M. The serial number indicates 68 and transformers indicate 67. by varaso » Tue Dec 18, 2018 2:56 pm I haven't really find the issue but the diode I connected to the outer lugs of the Intensity pot managed I am slightly perplexed after recapping a B1270 Princeton Reverb Ciruit. Also, can you share some more voltages and tell us which PT you used? Specifically maybe the voltages where the red secondaries hit the rectifier, the B+ leaving the rectifier, and all the Hoffman Amplifiers Tube Amp Forum, Hoffman Princeton Reverb (Why Sans Headroom & Other Questions) FENDER *PRINCETON REVERB-AMP AA1164" LAYOUT NOTICE MODEL VOLTAGES READ TO GROUND WITH ELECTRONIC VOLTMETER. The ones in the oval are signal (AC). The first was lowered from 1k to 470 to get the proper voltage drop using the 275-0-275v power Let's for the moment take 60 mA for both, that's 30 each, should be no strain on the transformer and you should see expected voltages. 50V. Read identical in design but the transformers, the Hoffman Amplifiers Tube Amp Forum, Red Plate 6V6 in Princeton Reverb. 00 USD Fender BR/BP/SP Princeton, Princeton Reverb Output Transformer $165. It does not affect the basic signal of the guitar but rather drives that reverb tank. Pulling The voltages all check out per a Princeton Reverb schematic and Rob Robinette's startup procedure using a light bulb current limiter (the bulb is always dim during testing). I'd say 68. Then I would have to say your hi voltage winding I have a PR build here experiencing a difficult birth. VALUES SHOWN +OR - 20%% NOTE: ALL I moved my HT center tap to an isolated ground, and that seems to have brought my HT secondary voltages to 325 VAC per side. 00 USD Fender Tweed Princeton & Champ I've got the Princeton style trem on my Hoffman AB763 Deluxe Reverb using 5881's and it has plenty of strength- but I did have to fiddle with the bias to get the sweet spot, about 42 ma TV-Reverb kit is compact version of Deluxe Reverb as the second channel of Deluxe Reverb without tremolo packed in a Princeton case. VOLTAGES READ -TO GROUND THIS UNDER ONE OR Hi y'all I intend to build a Princeton Reverb with 6AQ5 power tubes (cathode biased) Of course the plate and screen voltage would be too high with the Hammond 291AEX when using the Hoffman Amplifiers Tube Amp Forum, Princeton Reverb correct wiring of V5 and V6 Pull up the 65 Reissue Princeton Reverb schematic. I am getting some weird readings on a Silverface Princeton Reverb. Princeton Reverb Power Supply/Bias Check Sheet Tubes [from rear, left to right]: GZ34, 6V6GT(brown), 6V6GT(blue), 12AX7(1), 12AX7(2), 12AT7, 7025 Knobs: volume=1; treb,bass=5; I recently completed an AA1164 Princeton Reverb clone. Everything You might recall that I built a Mojotone Princeton Reverb clone last year. com and other kit makers but it is an advanced build so I don't recommend it as a first amp build but th FENDER *PRINCETON REVERB-AMP AA1164" LAYOUT NOTICE MODEL VOLTAGES READ TO GROUND WITH ELECTRONIC VOLTMETER. INSTRUMENTS 7025 BASS PEOAL Im having some issues with my Princeton reverb's trem. It was working just fine, and then all of a sudden it went really weak. The faceplate and baffle have been changed so that is what I have to go on. One triode in V3 is the reverb recovery stage while the other triode in V3 is So, I put the tubes in and re-measured voltages. I replaced it with a 1-tube The Princeton's reverb driver is a paralleled 12AT7 with 400 volts on the plates. My Princeton Reverb clone was getting what sounded like some blocking distortion (cutting in and out) with the volume anywhere from 7-10 and the bass maxed out (the problem Fender Tweed Deluxe, BP/SP Deluxe Reverb Output Transformer $170. tremolo test voltages info. Finally, as a last ditch effort I thought maybe the voltages were too high. I originally ordered the 125P1B type transformer from Weber known as the W022772. I'm a little fuzzy on where to connect the reverb transformer red wire in the micro circuit. The reverb driver tube has Building a Blackface Princeton Reverb Discussion in ' Audio Hardware ' started by DyersEve726, May 31, 2020. 00 USD Fender Tweed Princeton & Champ Power Transformer (Vintage Voltages) $168. aau snon Created Date Fender Princeton Reverb clone in amp head format built with premium components by Jonathan Stride, an experienced Florida amp builder/tech. V4 P8 is about 20% high vs the diagram. With a 10 inch speaker run by a 12-15W dual 6V6 amp, it delivers a true “American” Hoffman Amplifiers Tube Amp Forum, Princeton Reverb Problem on a new build Amp booted up, all voltages within spec, sounds good, quiet, trem and reverb work fine. 00 USD Fender BP Vibroverb Output The Fender Princeton (non-Reverb) really hasn't changed much since 1964, so I checked, and the AA964 schematic and layout mostly matches what I see in your photo. It has a test scenario and test voltages. An amp designed for a 5AR4 almost all of the time and in fenders especially were not over done in Tranny's an such to take over spec voltages. Installed tubes. Plate voltages are within spec (450 VDC on both), Negative bias voltage is good (-35. I replaced it I want the Princeton features, one channel amp, reverb, tremolo, Princeton basic tone, my complaint against this amp, it sound a bit like a bedroom amp, somes of you may disagree, but I'm I've got a Princeton Reverb Reissue (tweed version with the 12" speaker) that I got about a year ago. 3V. I confirmed with Here is the same wiring diagram with the signal paths coloured in. I measured the 220k at 1. I changed the two 18K dropping resistors in the power supply to 15K and 16K and By Rob Robinette Have comments or corrections? Email rob at: robinette at comcast dot net The 1964 blackface AA1164 Princeton Reverb is an iconic compact amp that can do just about anything. Voltages are as follows: 6V6 plates 452 VDC, 6V6 screens 448 VDC, PI plate 185 VDC, 3 rd (V2A) plate 158 Volt DC, Pre amp 2 (V1B) plate Hoffman Amplifiers Tube Amp Forum, can't find: Princeton Reverb/w. . That V2 tube is the reverb driver. The substitution of a Hoffman Amplifiers Tube Amp Forum, Princeton Reverb Blowing Fuse - Resolved Voltages on the power tubes seem low, 312 VDC on the plate and -10 on the grid (should be getting 390 and -37). Works perfectly, sounds killer, and runs super quiet as well. by Stevem » Mon Mar 11, 2024 10:15 am For the price of a reverb driver transformer and the tube you drive it you can get a SS reverb Author Topic: Fender Princeton Reverb Negative Bias voltage HELP (Read 3804 times) 0 Members and 1 Guest are viewing this topic. However when i cranked MV near full, then turn treble up - as I get around 70%, I get loud scratching Then with the info on voltages which are common in a preamp design developed for a 12ax7 triode tube type (?) and test with the corresponding current type setting at various pins or The Teagle/Sprung book indicates that the first Princeton REverb is the AA1164 amp. FENDER PRINCETON REVERB-AMP MODEL 31270" SCHEMATIC NOTICE 1. . MATERIAL: CHEMATIC & WIRING T REL. I fixed my bias issue (had a wrong resistor value), and discovered that I was being confused by a modification in a Mojotone layout I Pre-amp gain stage (V1 and V2) voltages are a bit higher in the Deluxe Reverb amps. Everything on the amp works well (sounds a bit thin) the bass pot does not add very much bass as Hoffman Amplifiers Tube Amp Forum, Advice on sort of El84 Princeton reverb w/o tremolo or similar circuit help (drive-by idea) Measure (DC) plate and cathode voltages on your preamp tubes. In the first part of '64, Princetons that Re: 1966 Fender Princeton Reverb by didit » Fri May 30, 2025 10:56 am Hello Aaron -- Cap can replacement in process, good. 5-2 volts on the cathodes. OM,RA o SPXR. I've done complicated pedal projects before with success, can solder effectively, and We would like to show you a description here but the site won’t allow us. Next episode: I disconnected one leg of I’m building a Princeton Reverb clone using a Hoffman layout in a Weber chassis. Two of the three voltage dropping resistors were changed. The amp sounds pretty good, but lacked a certain A big Plus 1 for what Wally is saying. NO. Dumb question: is the 477 volts with the power tubes in the amp or without them? Re: Princeton Reverb kit Screen Grid Problem by xtian » Mon Jan 02, 2023 7:15 pm After you get the bias voltages figured, assuming voltages are stable with NO power tubes, I'd try a Re: Princeton reverb 12at7 voltage is inconvenient. Everything sounds find. Green is the normal signal path, blue is the reverb circuitry, and red is the 'lead' sound. I tried swapping the tube from an rca 12ax7 to a known good tung Re: 6V6 Red plates on Princeton Reverb clone. That will be a good guide despite the circuit Enter My Tube Amp Parts Store Here Mobile users Enter My Tube Amp Parts Store Here The Tube amp Library of information Click the link above for Tube amp REVERB-AMP LAYOUT NOTICE VOLTAGES READ 10 GROUND WITH ELECTRONIC VOLTMETER, SHOWN INTENSITY SPEED S. Should be ~~170-180 volts on the plates, about 1. I checked all the plate voltages and found that they were 20 to 40 volts low compared to the schematic. 170-180 VDC on the plates of the 12AX7 tubes (vs. 00 Fender BP/SF Bandmaster, Pro Reverb Output Transformer $180. bceszsmkmlquhiaxkmqxqpthzfpllginppkfwfafunyslduqxyvjsucdqdwyuwjympmddae