Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing SRM 1-652 They have Y5E and 9-22

They have Y5E and 9-22 codes

Date Codes: 1-43 and NK

Tube One measured 63/67 while Tube Two measured 66/66 where minimum (65%) is 50/50 and 100% is 77/77

Transconductance measured 56/56 for Tube One and 58/58 for Tube Two where minimum (65%) is 25/25 and 100% is 38

Twenty-four years ago

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing SRM 1-652 They have Y5E and 9-22This new old stock TESTING matched pair of Sylvania 6SJ7s was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 57 for Tube One and 58 for Tube Two where minimum (65%) is 40. They have HG YCN and EJ date codes, respectively. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. Tube Two is a bit microphonic and it is therefore