(!!!!!) (Best Sylvania Pair) 6V6GT Sylvania green leaf coated glass NOS 1940's in white boxes (41ma and 44ma) (Same Gm)
(!!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1955 and 1968 (91ma and 96ma) (these are some of the best sounding 6B4G ever made)
(!!!!!) (Single) 6V6GT Ken Rad coated glass NOS 1940's (40.5ma)
(!!!!!) (Single) 6V6GTA Sylvania coated glass NOS 1950 era (53ma)
(!!!!) (Best Raytheon Pair) 6B4G Raytheon NOS 1940's separate plates (92ma and 93ma)
(!!!!) (Best Value Pair) 6B4G Raytheon NOS 1940's separate plates, 1 branded Philco (90ma and 91.5ma)
(!!!!) (Best Value Pair) 6V6GT Sylvania green leaf coated glass NOS/80% 1940's in white boxes (32.5ma and 33ma)
(!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1958-1967 (79ma and 85ma) (one of the best sounding 6B4G ever made)
(!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1963-1969 (86ma and 88ma) (these are some of the best sounding 6B4G ever made)
(!!!!) (Recommended Pair) 6V6GT Sylvania green leaf coated glass NOS 1940's in white boxes (35ma and 37ma)
(!!!) (Best Pair) 826 Ken Rad NOS 1942 same date codes original boxes strong emission
(!!!) (Best Pair) USN-CRC-76 RCA like new 1940's (5.8ma and 5.9ma)
(!!!) (Best Single) JAN-CKR-6SJ7 Ken Rad NOS 1944 (3.6ma)
(!!!) (Best Single) JAN-CKS-6SJ7 Ken Rad NOS 1944 (3.3ma)
(!!!) (Best Sylvania Pair) 6B4G Sylvania NOS 1940's same build (92ma and 95ma)
(!!!) (Best Value Single) JAN-CKR-6SJ7 Ken Rad NOS 1944 (2.5mA)
(!!!) (Best Value Single) JAN-CKR-6SJ7 Ken Rad NOS 1944 (2.6mA)
(!!!) (Recommended Pair) 76 Sylvania NOS - 1 tube branded National Union 1947 era same build (5.3ma and 5.6ma)
(!!!) (Recommended Single) 6SL7GT Ken Rad NOS 1945 era (2.1/2.3ma)
