Whats the proper way to TS a SS guitar amp?

Help is appreciated

The Amp is a gibson G20 from '71

original symptoms were low output. (that was last year, now its motor
boating)

I have a tektronix audio sig gen but don't know what/how to input
signal at the amp's guitar jack input.

Tha amp is "motor boating" whenever I plug anything (sig gen or
guitar) If I disconnect the this stage from the amp the signal is
amplified and clean when I inject a signal from the sig gen.

Is there a place I can post a schematic of this amp for others to
review and help me understand whats what.

Thanks for your time and concideration
Steve

e_mail: Steve98331atYahooDOTcom

.

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