(!!!!!) (Best Pair) 10Y=VT-25 SYLVANIA NOS 1940's (28ma and 28.8ma) (same Gm) 1-3% matched
(!!!!!) (Best Pair) 10Y=VT-25 SYLVANIA NOS 1940's (28ma and 28ma) 1-3% matched
(!!!!) (Best CV4003 Quad) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.4/9.0, 8.4/9.0, 8.4/8.8, 8.4/8.8mA)
(!!!!) (BEST OVERALL QUAD) 5U4GB Raytheon NOS "O" getters 1962 1-2% matched
(!!!!) (Best Overall Quad) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.8/8.8, 8.8/8.8, 8.6/8.8, 8.6/9.0mA)
(!!!!) (Best Quad) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.8/9.5, 8.8/9.4, 9.0/9.3, 9.0/9.4mA) (Highest Gm 1-2% matched)
(!!) (1 set of 10) 6SH7 GE metal can NOS (10 tubes for $34.99)
(!!) (Best Quad) 6SH7 GE metal can NOS 1976 (10.2, 10.2, 10.2, 10.2mA)
(!!) (Best Quad) 6SH7 GE metal can NOS 1976 (10.4, 10.5, 10.6, 10.6mA)
(!!) (Best Quad) 6SH7 GE metal can NOS 1976 (11.0, 11.2, 11.4, 11.4mA)
(!!) (Best Value Quad) 6SH7 GE metal can NOS 1976 (8.6, 9, 9, 9mA)
