5Y3

Encyclopedia : 5 : 5Y : 5Y3 : 5Y3

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.)

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.

References:

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

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