Nice NOS pair of 6SN7GT National Union VT-231 tubes made in the U.S in 1951. Black coated glass, black flat plates, silver printing, black base and bottom square getter (rebranded National International).
Matched pair, also checked for noise and microphonics with same codes 51-40
6SN7GT National Union6SN7GT National Union6SN7GT National Union

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This Post Has 2 Comments

  1. Mike

    How much for these?

  2. Takase Hironobu

    Do you have 4 tubes?.

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