Matched Pair Sylvania Number Type 59 #59 Vacuum Tubes Engraved Bases Zenith NOS NIB This lot of four Sylvania

This lot of four Sylvania 12Q7GT tubes tested to spec on our Paul Hart-calibrated TV7/U

OEM-BRANDED black glass 6K6GT tubes was tested on our Maxi-Matcher tube tester with 325 volts on the plates and a bias of -36 volts

34/34 and 38/41 where minimum (65%) is 25/25 and 100% is 38/38

Tube One (missing centering pin / keyway): Tube Two:

Matched Pair Sylvania Number Type 59 #59 Vacuum Tubes Engraved Bases Zenith NOS NIB This lot of four SylvaniaThis beautiful gray and silver matched pair of type Sylvania type 59 tubes was tested our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 73 while Tube Two measured 74 where minimum (65%) is 50. These tubes have mica snubbers for increased stability and lowered microphonics; sheet getters; outstanding flashing; anode radiators for cooler operation and longer tube life; engraved bases and