5Y3

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5Y3GT by General Electric, circa 1960 (right) and current production Sovtek (left)

The 5Y3 is a medium-power directly-heated rectifier vacuum tube introduced by RCA in 1935. It has found wide use in tube radios and early guitar amplifiers (of the Fender Champ type.) It is virtually identical, electrically, to the 4-pin type 80 tube, but with an octal base.

The success of the 80 and 5Y3 led to a slew of other very similar rectifier tubes of both higher and lower power ratings, including the 5V3, 5W3, 5X3, 5Z3, 5U4, and 5Z4. The epitome might have been the 3DG4 of the 1960's, with a full 240 milliamp capability.

Currently, a plug-in replacement is being manufactured by Sovtek in Russia, which is has very similar specifications, but is indirectly-heated, and can support currents up to 144 mA, versus the 120 mA of the original.

[edit] References:

[1] - 5Y3 datasheet from the RCA RC-29 Receiving Tubes Manual (NJ7P Tube Database)

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