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1) Combining the AB165 and AA864 The schematics for this amp is explained below.The red circles in the schematic below illustrates these changes.If you disconnect the NBF loop you’ll notice that the volume increases and tone gets much more aggressive. Not only is there a volume shift, the amp’s clean headroom is reduced slightly.Most importantly the tone gets rougher and rawer with more mids and higher frequencies, aka presence.All models have a push-pull (class AB) dual 6L6GC power amp configuration.Up to the blonde Bassman with blonde colored tolex (circuit 6G6) they all had tube rectifier, but since then a diode rectifier was used.
Some things have not changed since the beginning; The Bassman never had reverb or tremolo.
The bassman was a combo amp in the tweed era with the 1×15″ and 4×10″ speaker configurations.
From the blonde era Fender made the Bassman as a amp head and 2×12″ closed cabinet. The video below compares a Bassman AB165 to a Princeton Reverb and a Deluxe Reverb.
From right to left: – Switch the polarity of the two wires coming from the output transformer going to the speaker terminals.
You need to do this only if you change the negative feedback loop to AA864 specs.(click on image to view full size) 2) Negative feedback loop The negative feedback loop can easily be tweaked to alter the treble cut and distortion in your amp.