From tremolu–(at)–ol.com Thu Jan 19 11:17:08 CST 1995
Article: 37642 of rec.music.makers.guitar
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From: tremolu–(at)–ol.com (Tremolux)
Newsgroups: rec.music.makers.guitar
Subject: Re: Help:’69 Fender Super Reverb
Date: 18 Jan 1995 19:40:45 -0500
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Reply-To: tremolu–(at)–ol.com (Tremolux)

Fenders are not designed to be “distortion” amps, and to get one of the
old ones to distort, you really gotta crank it up. The Blackface mod
basically changes some resistor values in the phase inverter to give the
later model amps a bit more gain there like the older ones had. It also
removes some capacitors that kill harmonics, giving the amp much better
transient response and high-end.

The AB763 is the Blackface era circuit. The AA586 (I think) was the first
silverface bastardization that come out in 1968, shortly followed by the
AA1069, which un-did a few of the changes introduced by the 568. I think
there’s also an AA270, but I’m not positive.

I have an AA1069 Bandmaster Reverb head that I’ve converted to the 763
circuit, and it sounds noticibly better. That chassis now resides in a
combo cabinet with a 15″ JBL (I changed the output transformer as well).
Can you dig a “homebrew” Blackface Vibroverb at a fraction of the cost of
a real one? Shades of Stevie Ray

Damn near everyone I know who has a silverface Fender has had the mod
done.

Regards.