(!!) (Recommended Pair) 12HG7=12GN7A Sylvania NOS 1970 era (42ma and 43ma)
(!!) (Recommended Pair) 6BL7GT GE "D" getter NOS 1957 same build (34/36ma and 37/32ma)
(!!) (Recommended Single) 6AK5 Tungsol gray plate NOS 1956 (8.3ma)
(!!) (Recommended SIngle) 6V6GT Raytheon Silvertone black coated glass NOS 1940's (50.5ma)
(!!) (Recommended) 6SN7GTB Raytheon gray plates NOS 1960's in white box (9/10ma)
(!!) (SINGLE) 12BH7 CBS branded Arcturus Black Oval Plates large "U" getter NOS 1950's (10.2ma/13.0ma)
(!!) (slightly microphonic) 12AU7A Raytheon black ribbed plates "D" getter halo black coated glass 1951 (8.8/9.6ma)
(!!) 12AT7WC Raytheon NOS black plates triple mica 1975 (7.2/7.4ma)
(!!) 12AT7WC Raytheon NOS black plates triple mica 1975 (7/11ma)
(!!) 180C1=0B2 Mullard England NOS (neon)
(!!) 5842 Raytheon branded RCA NOS 1976 (20ma and Gm=20,000)
(!!) 5842 Raytheon branded RCA NOS windmill getter galo 1967 (28ma Gm=25,000)
(!!) 6336 Chatham by Tungsol metal plates used 1950's 1st series made (54ma/85ma)
(!!) 6EA7 Sylvania NOS 1960 era (2.1/43ma)
(!!) 6EA7=6EM7 Sylvania coin-base NOS 1970's (1.8/53.6ma)
(!!) 6EM7 Sylvania NOS 1960 era (1.5/55ma)
(!!) 6SN7GT Raytheon taller bottle parallel black plates NOS 1949 (8.2/8.0ma)
(!!) 6SN7GTB Raytheon black plates NOS 1960's (7.8/8.2ma)
(!!) 76 Sylvania NOS 1940's (5.8ma)
(!!) 80 GE GT-shape NOS 1957 slightly tilted glass (56/40 and 60/40)
