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Post subject: Princeton Reverb problems (1973?)--seeking diagnosis
Posted: Fri Mar 05, 2010 3:21 pm
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Would appreciate any help diagnosing a couple problems with my amp...

1. Notes are doubled by an ugly distorted tone in a higher octave, especially when the tone knobs are rolled off. More pronounced when I strike the string harder. Clear tone otherwise--there's just this extra buzz tracking along.

2. The reverb/tremolo is noisy--you can hear it ticking even when "speed" and "intensity" are rolled off (but especially when "intensity" is turned up)

thanks for any suggestions!


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Post subject: reverb
Posted: Fri Mar 05, 2010 3:35 pm
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Hey, The vibrato will always click you have to unplug the RCA jack where the pedal plugs in. If you dont have pedal I'm assuming someone has pluged a shorted RCA jack in the vibrato connector on back. and I could be wrong.

Trying to help: Raggs

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Post subject:
Posted: Fri Mar 05, 2010 4:37 pm
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Thanks for the suggestion, Raggs.

I checked, and there's nothing plugged into either RCA jack. I studied the ticking a little bit--there's the ticking when the vibrato is on (so that's normal?), and then there's an independent ticking, which is intermittent. Now I'm thinking it's some signal coming through my pickup.

To clarify on (1.)--maybe it's inaccurate to say the buzzing sound "tracks" the pitch of the note played. Also: the buzzing doesn't get much louder when I turn up the volume. So it's not coming through the speaker--either it's the speaker itself (blown?) or maybe something is loose?


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Posted: Fri Mar 05, 2010 8:42 pm
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Hi Carl, welcome to the forum. The buzzing sympton that you describe, seems to indicate a wornout filter cap can. That being said, the tubes are always a main suspect and of course the speaker. If possible substitute another speaker cab(8 or 16ohm) for a test. You'll also want to make sure the guitar cable is a good one. The Vib tick is only normal because most of us just put up with it(myself included). The fix would involve using quieter and/or lower gain tubes, and possibly replacing a number of resistors with a higher wattage or even a different type resistor. IMHO this always seemed a little obsessive. But if you need a super quiet amp for recording, then an amp tech can get to work on that noise. Maybe Ned can chime in, I believe he records with his Princetons. Art

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Last edited by aclempoppi on Sun Mar 07, 2010 11:56 pm, edited 1 time in total.

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Posted: Sat Mar 06, 2010 3:48 pm
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Carl, you probably should clean the tube sockets, a bad connection here can make that buzzing noise. Art

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