Matched Pair Raytheon 6K6 6K6GT Vacuum Tubes Black Plates Clear Bottle Gray Coated Glass

Matched Pair Raytheon 6K6 6K6GT Vacuum Tubes Black Plates Clear Bottle Gray Coated GlassThis matched pair of Raytheon black plate, clear glass 6K6GT tubes was tested on our Maxi Matcher tube tester with 325 volts on the plates and a bias of 36 volts. Tube One drew 21 milliamps' plate current while Tube Two drew 22. 4. Transconductance was 1620 for Tube One and 1730 for Tube Two where new nominal is within one standard deviation of 1900. These tubes have tall bases; black plates; clear bottles and bottom, D getters. As I write, I am

and if you need just one strong section

Transconductance measured 67/64 for Tube One and 71/69 for Tube Two where minimum (65%) is 50/50

Tube One has a crack in its Bakelite base (please see Picture) but is nonetheless securely-attached to its bottle

Sound was very good and the record was quite quiet

The title basically says it all

Transconductance measured 49

These four metal base National Union 6Q7GT tubes tested to spec on our Paul Hart-calibrated TV7/U

They measured 55/55 and 57/52 where minimum (65%) is 40/40 and 100% is 62/62

Its silkscreening is ghostly and appears to have been done for Mullard

There are eight new old stock

double D getter

36 and 48 where minimum (65%) is 29