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Like all silverface amps, the Pro Reverb was modified in the CBS periods to increase the clean headroom making it thinner and harder sounding.Having an AB763-similar circuit, there are many mechanisms in the circuitry that you can tweak to suit your needs, basically to increase or decrease the clean headroom.It has the same 2×12″ speaker configuration as the Twin Reverb but has a less powerful amp.It has half the number of power tubes, smaller transformers and a tube rectifier in stead of diodes.

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Replace the 12AT7 PI tube with a 12AX7 or 12AU7 – Less clean headroom.

You’ll have to increase the volume setting to achieve a similar volume as before.

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

If you also implement the tremolo disconnect mod you can really make the amp break up at practise volumes.

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.

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