(!) (Best Pair) 2A5 Tungsol NOS 1945 (90/50 and 90/50)
(!) (BEST PAIR) 43 Tungsol NOS 1947-1950 (84/58 and 85/58)
(!) (Best Pair) 5763 Sylvania JAN NOS 1973 (39.6ma and 40ma)
(!) (BEST PAIR) 6A5G Sylvania NOS 1940's - 1 branded Philco - same build (105ma and 107ma)
(!) (BEST PAIR) 6W6GT RCA NOS 1965 (41.5ma and 44.5ma) (same Gm)
(!) (BEST PRICE) 50C5 Mixed US Brands, Canada, Japan used/good (4 for $29.99)
(!) (Best Single) 2A5 RCA by Sylvania NOS 1947 (89/50)
(!) (Best Single) 2A5 RCA NOS 1940's (93/50)
(!) (BEST SINGLE) 6DQ5 Sylvania NOS 1960's (135ma)
(!) (Best Single) 6F6 RCA metal can NOS 1961 (46.5ma)
(!) (Best Single) 6ZY5G Philco NOS 1940's (53/40 and 54/40)
(!) (Best Single) F2a Siemens NOS 1960's (112ma) Tested on Amplitrex (pairs sold out)
(!) (BEST VALUE PAIR) EL84 Brimar England NOS 1962 (67ma and 66ma) (recommended for FIXED-BIAS amp only due to high current)
(!) (Best Value Pair) US Navy-CNU-1626 National Union NOS 1940's (30ma and 32.5ma)
(!) (BEST VALUE SINGLE) 45 National Union ST-14 NOS printed base 1940's (25ma)
(!) (Best Value Single) 6L6GC Sylvania NOS 1960's internals tilted (95ma)
(!) (BEST VALUE) ECL86=6GW8 RCA Holland NOS 1970 (0.9ma and 34.5ma)
(!) (BEST VALUE) EL34 Philips Holland brown base used/good 1960 era (95.5ma)
(!) (Good Value Pair) 8417 GE used/good 1970's (75ma and 78ma)
(!) (Good Value) 6BQ5 Sylvania gray plate used/very good 1960's faded printing (47.5ma)
