(!!!!!) (Good Value Pair - for Audio Aero) 6021=CV3986 Mullard UK Mitcham NOS 1969 (4.4/4.6ma and 4.5/4.8ma) (1-3% matched)
(!!!!!) (Good Value Pair) 12BH7A RCA gray ribbed plates NOS and like new 1960's (7.3/8.6ma and 7.2/7.7ma)
(!!!!!) (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)
(!!!!!) (Good Value Single) 12AX7 BRIMAR BVA England narrow ribbed plates like new 1959 (1.0/1.2ma)
(!!!!!) (Holland Single) 12AU7 Pope Holland NOS 1971 dimpled disc halo (12/13.4ma)
(!!!!!) (INFORMATION) 6N1 or 6N1P (Best Sounding Substitutes = 6BK7B, 6BQ7A, 6BZ7)
(!!!!!) (MATCHED QUAD) JAN-CW-231D Western Electric NOS 1953 (1.7/1.7/1.7/1.7ma) 1-2% matched
(!!!!!) (Recommended 5 Star Single) 5751 GE "5 Star" NOS gray plates triple mica "U" getter 1956 (2.1/2.2ma)
(!!!!!) (Recommended Mullard Pair) 6BQ5=EL84 Mullard UK branded RTC England NOS 1971-1978 (45.5ma and 48.0ma)
(!!!!!) (Recommended Pair - for Audio Aero) 6021=CV3986 Mullard UK Mitcham NOS 1969 (4.8/5.3ma and 4.8/5.0ma) (1-3% matched)
(!!!!!) (Recommended Pair 1959) 6DJ8=ECC88 Philips Miniwatt Holland large "O" getter halo NOS 1959 etched section on each tube (18.6/15.4ma and 16.4/15.8ma)
(!!!!!) (Recommended Pair 1960-1965) 12BH7A Sylvania gray oval plates NOS "O" getter (11.5/10ma and 10.5/10ma) (Art Audio, Quicksilver, Octave)
(!!!!!) (Recommended Pair) 12AX7=ECC83 Mullard UK ribbed plates NOS 1970-1974 (1.2/1.3ma and 1.2/1.1ma) (same Gm)
(!!!!!) (Recommended Pair) 12BH7A GE gray oval plates "O" getter 1965-1966 same build (10.0/10.2ma and 12/11ma)
(!!!!!) (Recommended Pair) 211 GE NOS 1943 in tan boxes (112.8ma and 113.8ma) (Highest mA)
(!!!!!) (Recommended Pair) 336A Western Electric NOS 1956 (39ma and 42ma) (matched on Amplitrex)
(!!!!!) (Recommended Pair) 5881 GE Canada NOS 1966-1967 (65.2ma and 68.5ma) (same build as Tungsol)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (56-58/40 and 57-58/40)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (60-64/40 and 60-66/40)