Hi guys. Refurbing this amp. Does this look close to a Princeton? Any recommended circuit changes?
http://www.jcayer.com/bricolages/renoamp.htm
Princeton
Moderators: pompeiisneaks, Colossal
- pompeiisneaks
- Site Admin
- Posts: 4222
- Joined: Sat Jan 14, 2017 4:36 pm
- Location: Washington State, USA
- Contact:
Re: Princeton
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
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
tUber Nerd!
Re: Princeton
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
- pompeiisneaks
- Site Admin
- Posts: 4222
- Joined: Sat Jan 14, 2017 4:36 pm
- Location: Washington State, USA
- Contact:
Re: Princeton
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.
~Phil
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.
~Phil
tUber Nerd!
Re: Princeton
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.
-
- Posts: 4602
- Joined: Fri Jan 24, 2014 3:01 pm
- Location: 1/3rd the way out one of the arms of the Milkyway.
Re: Princeton
I would audition a 20 to 100uf @ 35 volt cap across that 350 ohm output tube bias resistor.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: Princeton
Replaced 40uf caps with JJ 32s and it motorboats and cuts in and out. More to diagnose