Matched Pair Sylvania EL34 6CA7 Fat Boy Output Tubes Valves NOS-Testing Lot Of Twelve Transconductance measured 49/56

Transconductance measured 49/56

There are light-to-moderate pops and ticks which are not overly-intrusive as this is a fairly-loud album

I am playing them as I write in my Musical Paradise MP-301 MK3 and they sound excellent

As I write

These nine RCA 17BE3 / 17BZ3 tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Sylvania EL34 6CA7 Fat Boy Output Tubes Valves NOS-Testing Lot Of Twelve Transconductance measured 49/56This new old stock testing matched pair of 1960s vintage Sylvania Fat Boy EL34 6CA7 tubes was tested on our Maxi Matcher 2 tube tester with 400 volts on the plates and a bias of 36 volts on the grids for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 39. 2 milliamps' plate current while Tube Two drew 40. 2. Transconductance measured 5340 and 5260 micromhos, respectively where new nominal is within one standard deviation