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When hot, the filament releases electrons into the vacuum: a process called thermionic emission.
This cannot work in the reverse direction because the plate is not heated and cannot emit electrons.
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.
This is useful in converting the voltage from a wall outlet, typically 120 or 240 volts, into a higher voltage required by tubes in tube amps .
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.
These electrons will be drawn to a metal "plate" inside the envelope if the plate (also called the anode) is positively charged relative to the filament (or cathode).
The result is a current of electrons flowing from filament to plate.
Also, for reasons not explained, there are no Q-dated amps.
For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit.
a) Model - The first part of the serial number grouping determines the model of the chassis. (b) Serial number - The second part of the alphanumeric grouping is the five-digit serial number itself.
(c) Manufacture date - The last character determines the date of manufacture.
On most tubes, the leads are designed to plug into a tube socket for easy replacement.Tags: Adult Dating, affair dating, sex dating