Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes 9BR7 Nonal T61

Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes 9BR7 Nonal T61This matched pair of GE 6SL7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 31 34 while Tube Two measured 32 35where minimum (65%) is 32 32 49 49. They have steel plates; steel support rods; 1 13 188 5 and 188 5 date provenance codes; solid top mica spacers; side harp getters; tall bases; medium bottles and excellent flashing. I am playing them as I write

Two are available initially

rounded plates

period labels and stamped / engraved bases

This new old stock-TESTING matched pair of Sylvania silver top 6K6GT tubes was tested on our Maxi-Matcher tube tester with 325 volts on the plates and a bias of -36 volts for shorts

new in box Tung-Sol 66BC8 tube tested to spec on our Paul Hart-calibrated TV7/U

This GE 7716 tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 2670 micromhos for Tube One and 2430 for Tube Two

new in box RCA 6U10 tube tested to spec on our Paul Hart-calibrated TV7/U

a foil getter and mesh plates and the base wiggles a bit

It had no shorts or gas and measured 52/52 for Tube One and 56/56 for Tube Twoo where minimum (65%) is 40/40 and 100% is 62/62

a thimble getter and excellent flashing

new in box Raytheon CK1035 gas diode tube tested to spec