6EU7 Sylvania branded RCA NOS 1970's 

68/32

76/32

Tested on TV-7D/U

(6EU7=12AX7 with non-tapped filament of 6.3V wired to pins #1 and #2 to reduce hum;
claimed to be quieter than 12AX7)

Recommended for

- Sherwood

- Echoplex

- Gibson GA-5