7355 / 7408=6V6GT 

7355 GE (7355 is similar to 7591A with octal base, 18 watts) (Vplate max=500V, Vscreen max=400V) - Harman Kardon A 500 integrated amp - Harman Kardon A 50K linear amp - Stromberg Carlson ASR 880 1961 - Fender amps - Fender Snowman 1963 TO BUY 7355

7408=6V6GT Beam Power Tube (7408=Premium 6V6GT, controls over zero-bias characteristics, RCA are the best followed by GE) - HARMAN KARDON INTERLUDIE 1959 - Fender amps TO BUY 7408