Princeton

Fender Amp Discussion

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lpd
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Princeton

Post by lpd »

Hi guys. Refurbing this amp. Does this look close to a Princeton? Any recommended circuit changes?


http://www.jcayer.com/bricolages/renoamp.htm
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pompeiisneaks
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Re: Princeton

Post by pompeiisneaks »

I get :

Not Found
The requested URL /bricolages/renoamp.htm was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

~Phil
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lpd
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Re: Princeton

Post by lpd »

pompeiisneaks wrote: Thu Feb 01, 2018 11:57 pm I get :

Not Found
The requested URL /bricolages/renoamp.htm was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

~Phil
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pompeiisneaks
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Re: Princeton

Post by pompeiisneaks »

It looks pretty close to this one:

http://www.thevintagesound.com/ffg/sche ... _schem.gif

but not 100% identical, and no vibrato, plus that one has extra filtering, from 20uF to 40uF but otherwise, yes I think you're right.

I noted a coupling cap between the tone stack recovery and PI of .022 on the fender and this one shows .01 instead, and the power tubes are not fixed bias but cathode biased in this riviera as well.

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Re: Princeton

Post by sluckey »

One major difference... The triode that would be used for the tremolo oscillator in the Princeton is being used for an extra gain stage just prior to the PI in this amp.
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Re: Princeton

Post by Stevem »

I would audition a 20 to 100uf @ 35 volt cap across that 350 ohm output tube bias resistor.
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lpd
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Re: Princeton

Post by lpd »

Replaced 40uf caps with JJ 32s and it motorboats and cuts in and out. More to diagnose :)
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