10 Philco Number / Type 41 #41 Vacuum Tubes Engraved / Hot-Stamped Bases Lot Of Ten Beverly Sills This Groove Tube GT-ECC83-S /

This Groove Tube GT-ECC83-S / ECC83 / 12AX7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured 57 for Tube One and 65 for Tube Two where minimum (65%) is 36 and 100% is 55

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new in box Triangle-A 1L4 tube tested to spec on our Paul Hart-calibrated TV7/U

The four new old stock

10 Philco Number / Type 41 #41 Vacuum Tubes Engraved / Hot-Stamped Bases Lot Of Ten Beverly Sills This Groove Tube GT-ECC83-S /These ten Philco engraved hot stamped base type number 41 tubes tested as follows on our Paul Hart calibrated TV7 U: 52, 54, 54, 54 54, 54, 55, 58, 58 and 62 where minimum (65%) is 40 and 100% is 62.