(!!!) (Best Pair) 6203 GE NOS 1976-1979 (53-54/40 and 54-54/40)
$ 27.99
1 pair) 6203 GE NOS 1976-1979
1 tube) 54-54/40
1 tube) 53-54/40
6203 is a ruggedized 6X4 with 9 pins, a 6X4 has 7 pins
6203 heater current is 900ma, 6X4 heater current is 600ma
See more: vacuum tube
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 (Best Pair) 6203 GE NOS 1976-1979 (53-54/40 and 54-54/40)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/3_1_19d1e726-98b6-489e-813f-857fe353f593.jpg?v=1769545123){kind=link}
 (Best Pair) 6203 GE NOS 1976-1979 (53-54/40 and 54-54/40) "Pin It")