This is an archived website which has not been updated since 2002.
Some information may be inaccurate or out of date.

405 Alive Technical Index

Restoring Old Radios & Televisions

Decoding Valve, Transistor and CRT Numbers

Note that at least three, entirely different, series of valve designations begin with the letters VT (US Signal Corps, British Royal Air Force and British Post Office). This can be a major source of confusion, although not if you know the source of the device in question.

The Buyer's Guide has now moved to the excellent Radiocraft site at

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