Pair of Siemens E83CC NOS NIB Triple Mica 1967 Vacuum Tubes - 6% matched

Gm matched to about 6% difference, as tested on the Amplitrex AT1000. Identical 1967 date codes. From a small lot of identical tubes. Number E83CC. Small signal (i.e. 12AX7) tubes are generally checked for noise and microphonics; power tubes (i.e. 6L6) are usually not.

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