Dating a fender bassman

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.

Most importantly the tone gets rougher and rawer with more mids and higher frequencies, aka presence.We will further focus mostly on the AB165 vs AA864.Some things have not changed since the beginning; The Bassman never had reverb or tremolo.– 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.The NBF theory is that you take the signal from the speaker output, let it go through a resistor and mix it in at the entry point of the phase inverter.

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