FDP Forum / Princeton Mods, Bring 'Em On/ 27 messages in thread.

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Hammond101

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So. Cal. USA

Jul 15th, 2017 04:10 PM        

Just my personal opinion but I like to return old non working amps to original as close as possible. Save maybe a neg feedback mod.<br /> <br /> I'm doing a '79 PR at the moment for a customer. Somebody hacked it up pretty good in the past and turned it into a buzz saw.<br /> <br />



rfrakes331K

Contributing Member
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IL USA

RonHalen Jokingly He Says
Jul 15th, 2017 07:48 PM        

Buzz saw is not a desirable tone imho. So you can replace caps and bad resistors and that doesn't harm the originality? That is what I did and pots.



Peegoo

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The rain sounds like

a round of applause
Jul 16th, 2017 05:16 AM        

As long as you (1) use quality components identical in spec to the original circuit, (2) do tidy work, and (3) retain the original caps and other parts in a little bag to include with the amp, the value is not reduced by much--if at all. If the buyer is going to play the thing, the value is increased because the amp is healthy, reliable, and sounding great.



rfrakes331K

Contributing Member
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IL USA

RonHalen Jokingly He Says
Jul 27th, 2017 07:42 PM        

How about lowering the voltage with a variac?



Steve Dallman

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Merrill, Wisconsin

Age is just a number...mine is big
Jul 29th, 2017 08:27 AM        

I did the Stokes and Paul C mods on my 65 Princeton Reverb and kept both. No problems with the output transformer. I also changed to a dust cap modified Jensen C12N (new one) and love the result. I replaced the volume pot with a push pull pot, and wired in a bright switch, which I often use. It's my favorite amp. <br /> <br /> I bought it at a pawn shop for $89. The cabinet and baffle were in rough shape, but the chassis and face plate were near perfect.



pdf64



UK

Aug 13th, 2017 02:37 AM        

A potential problem with most variacs is that twist the knob the wrong way and they increase the mains voltage.<br /> If you want to lower the power output a bit, consider a lossier rectifier tube, eg 5y3, 5R4.<br /> That would also pretty much eliminate any chance of mods to the cathodyne mentioned above stressing the OT.



rfrakes331K

Contributing Member
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IL USA

RonHalen Jokingly He Says
Aug 30th, 2017 12:05 PM        

Mine doesn't have a step up transformer in it. So I can't go up. The sound doesn't thrill me when the voltage is turned down.



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