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15 Feb

Determining production date by serial number and transformer codes is better, and you should also inspect the circuit to be completly sure.1) Combining the AB165 and AA864 The schematics for this amp is explained below.The red circles in the schematic below illustrates these changes.The .1u F cap you are about to remove may be used later as coupling cap between phase inverter and power tubes.The negative feedback loop ends up at the left side of the 22 k Ohm resistor which is a new soldering point.

A couple of things in the circuitry were immediately changed in 1965 when the AA165 and AB165 replaced the AA864.

Amp collectors and idealists often prefer the pre-CBS models but if we study the AB165 circuit it does have something very interesting for guitar players who enjoy cranked Fender blackface tones.