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(!!!!) (Best Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (54-55/40 and 54-55/40 x 2 tubes)
(!!!!) (Best Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (54-55/40 and 54-55/40 x 2 tubes)
$ 47.99
1 pair) 6X4 SER = LM Ericsson Sweden NOS "D" getter 1950's 1% matched in white boxes
1 tube) 54/40 and 55/40
1 tube) 54/40 and 55/40
Aktiebolaget Svenska Elektronror = Limited Company Swedish Electron Tubes
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See more: vacuum tube