![]() ![]() We will further focus mostly on the AB165 vs AA864. The AA165 is very rare and its circuit and tone is quite similar to 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. We’ll come back to this later in the “blackface chapter” below where we’ll demystify some of the hypes with the popular AA864. A couple of things in the circuitry were immediately changed in 1965 when the AA165 and AB165 replaced the AA864. Unfortunately the Bassman was one of the first amps that CBS laid their hands on after buying the company from Leo Fender. The picture below shows a 1969 transition model amp. At the Fender factory they used old tube charts when new models came, probably because the tube layout was the same. Determining production date by serial number and transformer codes is better, and you should also inspect the circuit to be completly sure. The tube charts are not very useful for determining the circuit model. A lof of blackface Bassman amps with AA864 tube charts are actually AA165’s, and a lot of AA165 charts are glued into AB165 amps. Otherwise it will just be a fool’s discussion. The next time you get into a Fender Bassman discussion you should narrow down exact which era, model and circuit you’re discussing. Few other models experienced so many changes in terms of looks and tone. ![]() ![]() During the different eras the Bassman amp came in many different shapes and configurations. It was introduced in 1951, primarily targeted for bass guitar players and promoted as a bass amp for the Fender Precision Bass guitar, the first mass-produced electric bass guitar ever. The Fender Bassman is a legendary guitar amp known to both guitar and bass players. V2 12ax7 = 2’nd gain stage bass channel (and normal channel for AB165) ![]()
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