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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.
A third element called a "control grid" can be added to the design which provides the ability to amplify a signal.
Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.
When hot, the filament releases electrons into the vacuum: a process called thermionic emission.
typically 400V or more, and a lower voltage for the tube filament, typically 6.3 or 12.6V. Dating Marshall Amps In 1969 Marshall introduced a date coding system.
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.
From 1969 to 1983 the date code was after the serial number.
From 1984 to 1992 the model number was first, then the date code, then the serial number.
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Transformers are used to convert between high and low voltages, to change impedance, and to provide electrical isolation between circuits.