Matched Pair Sylvania Number Type 59 #59 Vacuum Tubes Engraved Bases Zenith NOS NIB OEM-BRANDED black glass 6K6GT tubes

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

I can't tell you how they sound as we don't have any equipment that runs them

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

This lot of two GE industrial-grade 1852 (6AC7) tubes was tested on our Paul Hart-calibrated TV7/U for shorts

an anode radiator for cooler operation and longer tube life and a banded-cross top mica spacer

Matched Pair Sylvania Number Type 59 #59 Vacuum Tubes Engraved Bases Zenith NOS NIB OEM-BRANDED black glass 6K6GT tubesThis 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