Matched Pair Ken-Rad 6SJ7 Vacuum Tubes NOS-Testing Matched Pair 7C5 This Sylvania number 76 tube

This Sylvania number 76 tube tested to spec on our Paul Hart-calibrated TV7/U

black plate

These four new old stock

new in box GE 12ED5 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 42/31 for Tube One and 44/31 for Tube Two where minimum (65%) is 30/15

Matched Pair Ken-Rad 6SJ7 Vacuum Tubes NOS-Testing Matched Pair 7C5 This Sylvania number 76 tubeThis new old stock testing, nicely matched pair of Ken Rad 6SJ7s was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 58 for Tube One and 60 for Tube Two where minimum (65%) is 40. They have G 5R and G SR date codes, respectively. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. They are microphonic and are fine in the preamp