Princeton Reverb mods.......

JGravity · January 3rd, 2005, 11:49 PM

after removing the feedback loop wire (from the speaker jack back to the ciruit board) it sounds even better. I have done a few small easily reversable mods to this amp and love every one of them!

so far....
6L6 tubes
higher phase invertor voltage (moves two wires)
SS rectifier
feedback loop removed
larger value treble bypass cap 125mfd from 25mfd.

Dacious · January 4th, 2005, 01:48 AM

You might want to check out how hot your power tranny is getting running two 6L6s and four 12A..7s - As a Champ item, they aren't rated for that much heater current.

I wouldn't have thought the 6L6s or ss recto would be a winner tonewise, either. But to each his own.

Tremo · January 4th, 2005, 11:22 PM

6L6 tubes in a Princeton is not recommended. That amp has a Champ PT, and it's maxed out as it was. Adding 6L6s makes it worse. If you want beefier output tubes, use JJ 6V6s.

eryque · January 5th, 2005, 11:32 AM

What effects did lifting the feedback wire and increasing the treble bypass cap have?

January 3rd, 2005, 11:49 PM	#1 (permalink)
JGravity TDPRI Member Join Date: Sep 2004 Posts: 43	Princeton Reverb mods....... after removing the feedback loop wire (from the speaker jack back to the ciruit board) it sounds even better. I have done a few small easily reversable mods to this amp and love every one of them! so far.... 6L6 tubes higher phase invertor voltage (moves two wires) SS rectifier feedback loop removed larger value treble bypass cap 125mfd from 25mfd.

January 4th, 2005, 01:48 AM	#2 (permalink)
Dacious Friend of Leo's Join Date: Mar 2003 Location: Godzone Posts: 2,623 35 Photos	You might want to check out how hot your power tranny is getting running two 6L6s and four 12A..7s - As a Champ item, they aren't rated for that much heater current. I wouldn't have thought the 6L6s or ss recto would be a winner tonewise, either. But to each his own. __________________ My other Telecaster is a Thinline The Tele Bible, Ch 1, v 10 Love thy Telecaster, covet not thy neighbour's Strat!

January 4th, 2005, 11:22 PM	#3 (permalink)
Tremo Banned Friend of Leo's Join Date: Mar 2003 Location: Silicon Valley, CA, USA Posts: 3,803	6L6 tubes in a Princeton is not recommended. That amp has a Champ PT, and it's maxed out as it was. Adding 6L6s makes it worse. If you want beefier output tubes, use JJ 6V6s.

January 5th, 2005, 11:32 AM	#4 (permalink)
eryque Poster Extraordinaire Join Date: Mar 2003 Location: albany, ny [not chicago] Posts: 7,241 44 Photos	What effects did lifting the feedback wire and increasing the treble bypass cap have?