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This is only a very brief overview and we suggest consulting additional resources if you are interested in additional information. Most good guitar amplifiers use tubes rather than solid-state components. The amplifier is a critical element in achieving the sound the musician desires. Tube amps are warmer, richer and have a more desirable tone than solid-state amps.
The distortion and speaker-damping characteristics of a tube amp with an output transformer matched to the speaker load is hard to replicate with solid-state devices.
In it's simplest form a vacuum tube can be created to operate as a diode: a device that conducts current only in one direction.
Some of the older Marshall amps have an inspection sticker on the top of the chassis which usually has the day, month and year the amp was actually made or inspected. Note, "A" Date Code ran for 18 months (July 1969 to December 1970) so the "B" date Code was never used and has been omitted. The serial number is generally located on the back of the chassis but from 79 to 80 it was on the front panel.
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.
Other configurations are also possible including the Pentode, a tube with 5 active elements providing an additional amplification factor.
There are a large number of tube varieties and uses.