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FDP Forum / Fender Amps: Vintage (before 1985) / Help me diagnose my 62 Princeton


Puget Sound

May 9th, 2016 11:43 PM   Edit   Profile   Print Topic   Search Topic

I wonder if folks could help me diagnose my Brownface 62 Princeton? I had it recapped in the mid 90's and new tubes installed then. I got it out yesterday after it has sat unused for a couple of years and now there is something not right with it. The tone is muffled and boomy, a lot less volume/headroom -- it's breaking up at 2-3. I tried swapping out the 12ax7's with a spare but no change. Thanks!

Contributing Member

Cincinnati, USA

May 10th, 2016 07:52 AM   Edit   Profile   Print Topic   Search Topic

Substitute all tubes.

Substitute the guitar.

Substitute the cord.

Play it through another speaker.

Play another amp through it's speaker.

Open it up and compare all DC voltages to the schematic, looking especially for DC on preamp grids that should be zero.

If this doesn't get you anywhere, you might consider taking it to an experienced tech.

Contributing Member

Too Near Atlanta GA

Amp Tech Emeritus
May 10th, 2016 07:53 AM   Edit   Profile   Print Topic   Search Topic

Since you have swapped out the preamp and the phase inverter, You might try cleaning the tone pot. Sitting unused will often leave the old control pots with a glaze on them that could cause the issues you're experiencing.


FDP Forum / Fender Amps: Vintage (before 1985) / Help me diagnose my 62 Princeton

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