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Amplifier dating

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.

When hot, the filament releases electrons into the vacuum: a process called thermionic emission.

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.

The resulting negatively-charged cloud of electrons is called a space charge.

Is there a website or anything where I can figure out how old a Marshall amp is?

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.

Well, on the way back to Scam Cash I decided to stop in Banjo Sinner for a quick look around and there it was. I played, I pulled out the cash for a deposit and I'm bringing it home tomorrow night. I checked there's nothing there to figure that out. I've got some other cool stuff here like a VHT Pitbull, Vox, Sound City 120 (might be for sale BTW) Boogie etc. Almost three years ago I let a single channel 800 slip through my fingers because it was a 100 watt and I wanted a 50.

Good thinking Jay, I would choose any 800 over any 900 or 2000. Rather then pull a pair of power tubes I figured I'd look around and find another one in a month or two.

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I just scored a 2205 which is a JCM 800 two channel 50 watter with 'verb.

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