Dating fender guitar amplifiers
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.
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.
If your amp dosen’t have a date code, flip the amp upside-down and check the transformers, and speakers for their manufacturer codes.
If possible, open up the chassis and check a few of the pots’ and capacitors’ manufacturer codes.
First use the cosmetic features to get a range of possible years.
Next, (if applicable) look for the date code on the tube chart.
From 1984 to 1992 the model number was first, then the date code, then the serial number.
The electrodes are attached to leads which pass through the envelope via an air tight seal.
On most tubes, the leads are designed to plug into a tube socket for easy replacement.
Tube amps are particularly popular with serious musicians.
Many musicians prefer to play vintage Fender, Marshall and Gibson amps.
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Amps should only be serviced by a qualified technician.