Dating a fender bassman head

However, tubes are still used in several specialized applications such as guitar amplifiers (also called a valve amp outside the U.

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The electrodes are attached to leads which pass through the envelope via an air tight seal.

On most tubes, the leads are designed to plug into a tube socket for easy replacement.

The next time you get into a Fender Bassman discussion you should narrow down exact which era, model and circuit you’re discussing. 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.

Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.