The bass/treble knobs are 9600 volume knobs, which are set-screw type as original. The Phono 2 Gain knob is a 9600 sound injection knob which is also set-screw type. Speakers, Input, Loudness and Mode are 9600 Speaker/Selector knobs, which were "modified" by drilling the plastic splined insert with a 15/64" bit and pushing them on for a
very tight fit. It took knobs from two 9600s to do this, but I had them in a drawer. They are acceptable place-holders until the real deal shows up, which might be never.
A Model 500 with correct knobs for reference
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This one came advertised as "no sound" minus most knobs and the top cover. I "fixed" it by putting a knob on speaker select and turning it to "A". The amp works flawlessly.
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