From mt2–(at)–ornell.edu Mon Jul 12 12:50:51 CDT 1999
Article: 189184 of alt.guitar.amps
From: Mike Tolomeo
Newsgroups: alt.guitar.amps
Subject: Re: Princeton reverb phase inverter mod (help?)
Date: 12 Jul 1999 16:02:42 GMT
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In article <3Mbh3.919$ma.152402--(at)--ews.abs.net> Steve Watson,
gz3–(at)–otmail.com writes:
>Tremolux responed to a query I made about this mod in an email, but
>unfortunately, he assumed I could read a schematic. I used to have a
>step-by-step description of how to do thjis, and even performed the
>operation on a couple PRs I had in the past. Alas, I cannot read
schematics,
>I cannot find the printout of the instructions, and i’m not about to risk
>damage to my sweet lil’ BFPR without explicit instructions on how to do
>this.
>Can anyone help me out here? All I really need are some landmarks on the
>circuit board (and maybe which lead on the PI tube gets moved) to guide
>myself with.
>Thanks in advance!
>Steve

If this is the mod where you increase the PI plate voltage, you can check
out my notes at http://www.people.cornell.edu/pages/mt24/Amp/

Click on the “Increase headroom of a split load PI” link. I’ve got
drawings of the layout–it’s a silverface amp, but maybe it’ll help.