[AMRadio] Rectifier tubes

D. Chester k4kyv at charter.net
Wed Dec 19 15:32:16 EST 2007

> Can another tube such as 5Y3 or 5U4 be substituted for
> 5Z4? Have you done it? 73, John, K5PGW

The 5Y3, 5Y4, 80 and 5Z4 have 2 amp filaments.  The 5U4 and 5Z3 have 3 amp 
filaments.  The Z3 and U4 are equivalent except for base and socket 

Don k4kyv 

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