1 Matched Pair) 6EU7 RCA ribbed plates NOS 1967

1 tube) 57/32 and 50/32

1 tube) 52/32 and 56/32

tested on TV-7

(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

- Echoplex

- Sherwood

- Gibson GA-5