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FDP Forum / Amp Mods, Repairs, and Projects / Princeton Mods, Bring 'Em On

Previous 20 Messages  
Hammond101
Contributing Member
**********

So. Cal. USA

Jul 15th, 2017 04:10 PM   Edit   Profile   Print Topic   Search Topic

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.

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.



rfrakes331K
Contributing Member
*******

IL USA

RonHalen Jokingly He Says
Jul 15th, 2017 07:48 PM   Edit   Profile   Print Topic   Search Topic

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
Contributing Member
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The rain sounds like

a round of applause
Jul 16th, 2017 05:16 AM   Edit   Profile   Print Topic   Search Topic

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
*******

IL USA

RonHalen Jokingly He Says
Jul 27th, 2017 07:42 PM   Edit   Profile   Print Topic   Search Topic

How about lowering the voltage with a variac?

Steve Dallman
Contributing Member
**********

Merrill, Wisconsin

Age is just a number...mine is big
Jul 29th, 2017 08:27 AM   Edit   Profile   Print Topic   Search Topic

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.

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   Edit   Profile   Print Topic   Search Topic

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

rfrakes331K
Contributing Member
*******

IL USA

RonHalen Jokingly He Says
Aug 30th, 2017 12:05 PM   Edit   Profile   Print Topic   Search Topic

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.

Previous 20 Messages  

FDP Forum / Amp Mods, Repairs, and Projects / Princeton Mods, Bring 'Em On




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