(!) (Recommended Pair) 0B2 GE Italy NOS 1977 (argon gas)
(!) (Recommended Pair) 0B2 RCA NOS 1970 (neon gas)
(!) (Recommended Pair) 12B4A RCA NOS 1963 (40ma and 41ma)
(!) (Recommended Pair) 12B4A Sylvania NOS 1960's (26ma and 27ma)
(!) (Recommended Pair) 5749=6BA6W Sylvania NOS 1966 (11.2ma and 10.4ma)
(!) (Recommended Pair) 6BL7GTA Sylvania Zenith 1963 and 6BL7GT Sylvania 1960 era NOS (38.5/34ma and 33/37ma)
(!) (Recommended Pair) 6LF6 Sylvania NOS same build (115ma and 121ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
(!) (Recommended Single) 6L6GC Sylvania NOS 1960's (63.5ma)
(!) (Recommended Single) 6N7GT Raytheon coated glass NOS 1940's (3.2/3.5ma)
(!) (Recommended SINGLE) 6U8A Sylvania NOS 1960's (19.8ma/10.6ma)
(!) (Recommended Single) 7F7 Sylvania rebranded JAN-CBRZ-7F7 round gray plates used/like new 1940's (2.9/3.2ma) (highest testing single)
(!) (Recommended Sylvania Pair) 6BQ5 Sylvania black plate 1960's and 1973 (68ma and 62.5ma) (recommended for FIXED-BIAS amp only due to high current)
(!) (Single) 5963=12AU7 GE NOS 1960's (11.6/11.8ma)
(!) (Single) 5BK7A GE gray plates "U" getter NOS 1964 (7.5/10.5ma)
(!) (Single) 5BK7A GE gray plates "U" getter NOS 1973 (8.5/11ma)
(!) (SINGLE) 7N7 Sylvania TALL BOTTLE branded Hytron parallel black plates chrome top NOS 1952 (6.6/8.3ma)
(!) (SINGLE) 7N7 Sylvania TALL BOTTLE branded Hytron parallel black plates chrome top NOS 1952 - small chip/blemish at top of tube (7.6/7.8ma)
(!) (SINGLE) ECC85=6AQ8 Sylvania black plates NOS 1960's (10.2/10.4ma)
(!) (SINGLE) ECC85=6AQ8 Sylvania black plates NOS 1960's (12.2/9.8ma)
(!) (SINGLE) ECC85=6AQ8 Sylvania black plates NOS 1960's (8.4/14ma)
