S.) and high power RF transmitters, as a display device in television sets and in microwave ovens.
Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.
The simplest vacuum tubes resemble incandescent light bulbs in that they have a filament sealed in a glass envelope which has been evacuated of all air.
For example, the logo on the amp or materials used during a certain time period of production.
Dating an amplifier by serial numbers can be effective as well.
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