(!!) (slightly microphonic pair) JAN-6SL7GT=VT-229 RCA NOS and like new 1940's (2.5/2.4ma and 2.4/2.6ma) 1-3% matched
(!!) (slightly microphonic) 6SL7GT RCA NOS 1950 (2.2/2.3ma) 1-2% section balance
(!!) (slightly microphonic) 6SL7GT RCA NOS black plates gray coated glass 1952 (2.8/2.8ma) 1% section balance
(!!) 6SL7GT Sylvania NOS 1960's (2.6/2.2ma) (Eddie Current)
(!!) 6SL7GT Sylvania NOS branded Westinghouse tall bottle 1955 (2.8/2.7ma)
(!!) 6SL7GT Sylvania NOS branded Zenith 1950's tall bottle (3.0/2.9ma)
(!!) 6SL7GT Sylvania NOS tall bottle 1955 (2.0/2.2ma)
(!) (Pair 1950's) 7F7 Sylvania round gray plates chrome top 1949-1950 same build (2.1/2.4ma and 2.1/2.0ma)
(!) (SINGLE) 6SL7GT RCA round black plates NOS 1970 (2.0/2.1ma)
(!) (slightly microphonic) 6SL7GT=VT-229 RCA round black plates like new 1942-1945 era (2.4/2.6ma)
(!) (slightly microphonic) JAN-CRC-6SL7GT RCA NOS black plates 1951 tilted glass (2.0/2.2ma)
(!) 6SL7GT RCA burgundy base NOS 1951 (1.7/1.8ma)
5691 RCA Red Base Black Plates used 1948 (2.2/2.4ma) (Gm=62% and 75%)
6SL7GT Brimar NOS black base black plates 1950's (2.2/2.4ma) (slightly microphonic)
