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It requires some experience to get a balanced and sweet tone from a Super Reverb because of its power and loud speaker configuration.

Most of the maintenance and mod tips below are recommended for those who want the amp to break up earlier, reaching the sweet spot at a lower volume.

The AB763 design is also to be found in some silverface amps between 19.

The later silverface circuits were changed further by CBS to become cleaner, harder and thinner sounding, specially if one compares amps at the same volume and EQ setting.

Tube mods, such as pulling the V1 out and using a 12ax7 as V6/PI, will take you a long way.

Next, if your speakers are efficient and too loud for the occasion, then why not disconnect two of them in just 5 seconds?

The reason is that 12AX7 tube has a voltage gain factor = 100, while 12AT7 = 60 and 12AY7 = 45.

Pull out the V1 normal channel preamp tube – More preamp gain in vibrato channel We’ll start with saying that this is a mod we personally do to all dual channel blackface, silverface and reissue amps.

The blackfaces have more growl and a distorted, cranked tone.Model/Circuit Number: AB763, AB568, AB569, AA1069, AA270, AA1070 Years of Production: 1968 – 1981 Era: Silverface Configuration: Combo Controls: Silver, forward facing w/ blue labels Knobs: Black skirted with chrome center, numbered 1 – 10 Faceplate Bias: Fixed, adjustment pot (AB763) or balance pot (all others) Rectifier: 5U4GB , Some later production models seem to have come without the 5U4 rectifier and had solid state rectification instead.Comments: Fender added int he Master Volume control with pull-knob Boost in 1975.You’ll need schematics to implement some of these mods. We usually start with explaining a mod from a functional perspective where we relate to components in the logical schematics diagram.Finally we point out location of components in the physical layout diagram.

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