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(!!!!) (Best Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (55-56/40 and 55-56/40 x 2 tubes)
(!!!!) (Best Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (55-56/40 and 55-56/40 x 2 tubes)
$ 47.99
1 pair) 6X4 SER = LM Ericsson Sweden NOS "D" getter 1950's 1% matched in white boxes
1 tube) 55/40 and 56/40
1 tube) 55/40 and 56/40
Aktiebolaget Svenska Elektronror = Limited Company Swedish Electron Tubes
Recommended for
Audio Note DAC 1.2
LAMM LP2 phono
KONDO KSL M7 preamp
Kondo M77 preamp
Eastern Electric Minimax Phono
Pultec EQ
Wright WPP200C
Audio Note M7
See more: vacuum tube
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 (Best Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (55-56/40 and 55-56/40 x 2 tubes) "Pin It")