(!) (PAIR) 1626=VT-137 RCA NOS 1940's (31ma and 33.8ma) (Same Gm)
(!) (PAIR) 7189 Sylvania black plate NOS and like new 1960's (52ma and 56ma)
(!) (PAIR) 7408=6V6GT GE Stromberg Carlson 1960 used/good (37.2ma and 39.2ma)
(!) (PAIR) EL86 Valvo Holland NOS original boxes 1969 (55ma and 56ma)
(!) (Recommended Mullard Pair) EL36 Mullard Blackburn UK NOS 1963 - 1968 (93ma and 87ma)
(!) (Recommended Pair) 41 GE Canada GT-shape glass NOS 1950 era (74-75/40)
(!) (Recommended Pair) 6GM5 Sylvania NOS 1960's - 1 tube branded Tungsol (55ma and 56ma)
(!) (Recommended Pair) 6JT6A RCA NOS (75ma and 78.5ma)
(!) (Recommended Pair) 6LF6 Sylvania NOS same build (115ma and 121ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
(!) (Recommended Pair) EL36 Haltron Japan clear top NOS 1960's (86ma and 93ma)
(!) (Recommended Single) 5881=6L6WGB GE NOS 1960's (72.5ma)
(!) (Recommended Single) 6BQ5 Tungsol NOS 1960 era (39ma)
(!) (Recommended Single) 6L6GC Sylvania NOS 1960's (63.5ma)
(!) (Recommended Single) 8068 GE Hewlett Packard NOS 1968 (42ma)
(!) (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) 6BQ5=EL84 Heath Mullard Great Britain used/good 1959 (40ma)
(!) (SINGLE) 6JS6C Sylvania Zenith NOS (75ma)
(!) (SINGLE) 7027A RCA NOS 1971 (61.5ma)
(!) (SINGLE) 841=VT-51 Hytron NOS 1940's (5.2ma Gm=1200)
(!) 203A Sylvania brass base tests like new 1930's
