Fender amplifier output transformer codes dating


04-Jan-2018 04:50

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All models have a push-pull (class AB) dual 6L6GC power amp configuration.

If you find a number that starts with 2 letters on your speaker use the Fender Amp dating form.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.1) Combining the AB165 and AA864 The schematics for this amp is explained below.

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The red circles in the schematic below illustrates these changes.– Remove the 220k feedback resistors from each of the plates on the two 6L6 tubes.You will get more breakup and distortion and more volume at a given volume knob setting.At the Fender factory they used old tube charts when new models came, probably because the tube layout was the same.