Dating fender amps chassis number
Other configurations are also possible including the Pentode, a tube with 5 active elements providing an additional amplification factor.
You should be able to find a number stamped somewhere on the speaker’s frame.Amps should only be serviced by a qualified technician.Whether it’s a vintage amp or a recent model such as this Fender Pro Reverb, hum can have several causes.It consists of a minimum of two coils, the primary and the secondary, wound on the same core.
An alternating current in one winding creates a time-varying magnetic flux in the core, which induces a voltage in the other windings.
For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit.