Matched Pair Unitron 6AK5 5654 6J1 6J2 Vacuum Tubes NOS NIB 9U8 Transconductance measured 35

Transconductance measured 35

GE-BRANDED 40KG6A / PL509 tube tested to spec on our Paul Hart-calibrated TV7/U

All were made by Sylvania

54/53 and 54/55

Matched Pair Unitron 6AK5 5654 6J1 6J2 Vacuum Tubes NOS NIB 9U8 Transconductance measured 35This new old stock, new in box (For Tube One) matched pair of Unitron 6AK5 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they tested as follows: Tube One (Unitron 5654 LABELED, likely Tung Sol MANUFACTURED) measured 31 while Tube Two (no silkscreening 6AK5 LABELED, likely Tung Sol MANUFACTURED) measured 33 where minimum (65%) is 22. Both tubes are the same on the inside with