6X4 SER = LM Ericsson Sweden “”D”” getter NOS 1950”s slightly tilted glass in white box
Aktiebolaget Svenska Elektronror = Limited Company Swedish Electron Tubes
52/40
54/40
40=65%
50+=100%
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


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