(!!!!!) (Best Overall Pair) 5V4G RCA NOS black plates 1950 (60-62/40 and 60-62/40) 1-2% matched (next best to GZ32 Mullard UK)
(!!!!!) (BEST OVERALL SINGLE) CV378=GZ37 Mullard "D" getter NOS 1955 faded printing (56/40 and 56/40) (1st version made with skinny bottle)
(!!!!!) (Best Single 1967) 6DJ8=ECC88 Philips Miniwatt Holland "o" getter 1967 (16/18.8ma)
(!!!!!) (Best Single) 6DJ8=ECC88 Philips Miniwatt Holland "O" getter 1965 (21/23ma) (Highest mA and Gm)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (56/40 and 56/40) 1% balance
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (57/40 and 58/40)
(!!!!!) (Best Tungsol Pair) 5881 Tungsol 1960-1967 like new and used - same build (66.2ma and 66.5ma)
(!!!!!) (Good Value Pair) 12BH7A Sylvania gray pinched plates NOS and used 1970 era (7.6/8.0.4ma and 7/7ma)
(!!!!!) (Good Value Pair) 6350 Sylvania black plates NOS 1950's "D=SQUARE" getter rebranded United (8.8/9.2ma and 9/10.2ma)
(!!!!!) (Recommended Pair) 6350 Sylvania rebranded United black ribbed plates NOS large "U" getter halo 1955-1957 (10.8/12.4ma and 10.8/11.5ma)
(!!!!!) (Recommended Pair) 6BK7B RCA black plates NOS 1960's (9.5/10ma and 9.8/10.6ma)
(!!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1955 and 1968 (91ma and 96ma) (these are some of the best sounding 6B4G ever made)
(!!!!!) (Recommended Single) 421A Western Electric NOS 1969 (85ma and 75ma)
(!!!!!) (Recommended Single) 421A=5998 Western Electric NOS 1984 (81ma and 94ma)
(!!!!!) (Recommended Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (53/40 and 53/40)
(!!!!!) (Recommended Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (56/40 and 60/40)
(!!!!) (2nd Best Pair) 5V4G RCA NOS 1951-1953 (61-61/40 and 60-61/40) 1-2% matched
(!!!!) (2nd Best Single) JAN-5998 Tungsol black plates top and side getter NOS 1966 (88ma and 101ma)
(!!!!) (2nd Best Single) JAN-5998 Tungsol black plates top and side getter NOS 1966 (91ma and 103ma)