Matched Pair Raytheon 6V6 6V6GT Vacuum Tubes Gray Glass

Matched Pair Raytheon 6V6 6V6GT Vacuum Tubes Gray GlassThis new old stock TESTING matched pair of Raytheon gray glass 6V6GT output tubes was tested on our Maxi Matcher 2 at real operating voltages of 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 23. 5 milliamps 2310 micromhos for Tube One and 24. 7 2200 for Tube Two. (New US made 6V6s typically test with plate current from the mid teens to mid 30s with

52 and 60 where minimum (65%) is 36 and 100% is 55

Transconductance measured (From left to right): 36

This perfectly-matched pair of RCA gray plate 5763 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

These eight Philco 7B8 tubes tested as follows on our Paul Hart-calibrated TV7/U where minimum (65%) is 29 and 100% is 45:

new in box Hytron 7B6 tube tested to spec on our Paul Hart-calibrated TV7/U

They have 7-09 188-5 and 630 188-5 date/provenance codes

they can put out as much as 2A3s and fell into disfavor because of socket supply issues

new in box RCA 12AF3 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box Westinghouse 7A8 tubes tested to spec on our Paul Hart-calibrated TV7/U

Gain (Mu (µ): 17 / 17

Three are GE and two are Sylvania

Plates: gray ladder plate