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This is only a very brief overview and we suggest consulting additional resources if you are interested in additional information. Most good guitar amplifiers use tubes rather than solid-state components. The amplifier is a critical element in achieving the sound the musician desires. Tube amps are warmer, richer and have a more desirable tone than solid-state amps.
The distortion and speaker-damping characteristics of a tube amp with an output transformer matched to the speaker load is hard to replicate with solid-state devices.
Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.
Although the envelope was classically glass, power tubes often use ceramic and metal.
Replacement tubes and transformers are readily available for these amps however there are many boutique amp manufacturers making new tube amps with a vintage sound.
A transformer is an electrical device that transfers energy from one circuit to another by magnetic coupling with no moving parts.
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.
We are not responsible for typographical errors, inaccuracies and omissions on this web site.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.However, tubes are still used in several specialized applications such as guitar amplifiers (also called a valve amp outside the U.S.) and high power RF transmitters, as a display device in television sets and in microwave ovens.
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The result is a current of electrons flowing from filament to plate.