I have for sale a recently tested (1 month ago) matching pair of Tung Sol Jan-CTL-6sn7gt Black Glass Oval Mica tubes. One tube was re-glued 6 months ago, which has now held fast after many cycles. The blown up photo’s certainly don’t hide any warts and all, but in truth they look fine to the naked eye. The last photo shows them in my amp. They have no noise issues and sound exactly the same as my NIB pair. Price does not include postage.

Valve tester AVO VCM 163

Test parameters for type 6SN7
Heater, 6 Volts
Plate, 250Volts
Control Grid, 8Volts Negative

New 6SN7, 9 MA 2.9 MA/V

Test 5
Plate 1 7.5 ma 2 ma/v
Plate 2 7.6 ma 2 ma/v

Test 7
Plate 1 7.4 ma 2.2 ma/v

Plate 2 7.6 ma 2.3 ma/v