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6DQ6B Curtis Mathes hi-fi JAPAN used/good 1960's (60.5ma)
6DQ6B Raytheon JAPAN like new 1960's (60ma)
6DW4 Sylvania branded GE tipped top NOS (1 pair)
6DW4 Sylvania tipped top like new
6DW4B Westinghouse Japan like new 1960's
6DX8=ECL84 GE Hitachi JAPAN 1972 (5.1mA and 13mA) (Shindo)
6DX8=ECL84 GE Hitachi JAPAN 1978 (3.0mA and 14mA) (Shindo)
6DX8=ECL84 Motorola Toshiba JAPAN used/good 1960's (3.3mA and 12.5mA) (Shindo)
6EC4A=EY500 GE JAPAN NOS 1960's (1 pair)
6ER5 RCA branded GE NOS 1960's (12ma Gm=10,800)
6ER5 Sylvania NOS 1960's faded printing (10.6ma Gm=13,000)
6ES5 Sylvania rebranded GE NOS
6ES6=6FD6 International NOS
6GK5=6FQ5A GE branded RCA NOS (17.4ma)
6GK5=6FQ5A GE NOS (9ma)
6GK5=6FQ5A Sylvania NOS (10ma)
6GU7 Magnavox RCA used/like new 1964 (10.2/9.8ma)
6GU7 RCA NOS 1975 (8.6/10ma)
6GU7 Sylvania Zenith NOS 1962 (14.0/14.6ma)
6JC6A Raytheon Japan NOS 1960's (16.0ma) (High Ma and Gm)
