Start Dating vintage fender speakers

Dating vintage fender speakers

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.

and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space.

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.

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.