From tremolu–(at)–ol.com Fri Apr 3 15:24:40 CST 1998
Article: 95648 of alt.guitar.amps
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From: tremolu–(at)–ol.com (Tremolux)
Newsgroups: alt.guitar.amps
Subject: Re: SF Princeton Reverb Questions
Date: 3 Apr 1998 16:35:48 GMT
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Xref: geraldo.cc.utexas.edu alt.guitar.amps:95648

You guys are way off base here, you don’t understand the circuits.

First off, a totally healthy Princeton Reverb puts out closer to 18 Watts at
the onset of visible waveform clipping (I have one, a 69, and I measured it).

Secondly, the split-load type phase inverter’s lack of gain does not
necessarily limit the power output. There’s plenty of gain from the input jack
to the 6V6 grids to drive them into saturation. Bear in mind that this type of
phase inverter is used on the old Tweed Pros that put out 35 or so Watts, it’s
used on Orange amps including the 80 Watters, numerous hi-fi amps, and I think
a variation was used on the 200 Watt Marshall Major.

The Princeton’s power is limited by the plate voltages on the 6V6s and the
output transformer.

If your Princeton’s split load phase inverter is running out of dynamic
headroom before you can fully saturate the 6V6s, the fix is simple and you
don’t need to butcher up the circuit with bullshit phase inverter mods. It
simply needs a higher voltage supply feed. Move the B+ feed line for the phase
inverter one step closer to the rectifier in the power supply’s voltage divider
chain. I did it to mine and it worked perfectly. As a matter of fact, IMO all
PRs could benefit from this simple mod.