The table below outlines the meaning of these letter codes.Marshall amplifiers didn’t start using true serial numbers until July of 1969.Many overseas internet sites that you may be looking at may not quote you the price inclusive of their local taxes, freight to Australia, Australian duty (which is applicable to guitars and amps) customs clearance charges, port charges and surcharges and other government charges which may also include a quarantine inspection charge, and GST.
Although the envelope was classically glass, power tubes often use ceramic and metal.
The electrodes are attached to leads which pass through the envelope via an air tight seal.
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The earliest Marshall amplifiers were made in 1962 and had no model or serial numbers.
S.) and high power RF transmitters, as a display device in television sets and in microwave ovens.