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During the different eras the Bassman amp came in many different shapes and configurations.
Few other models experienced so many changes in terms of looks and tone.
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.
Unfortunately the Bassman was one of the first amps that CBS laid their hands on after buying the company from Leo Fender.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.– You need to insert a 100 ohm resistor between the left side of 22 k Ohm resistor to ground (the new entry point of the neg feedback loop in previous step).– Between the second preamp tube (V2) and the phase inverter circuitry, replace the 0.1u F coupling cap with a 500 p F.