Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods NOS-Testing

Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods NOS-TestingThis new old stock TESTING matched pair of GE 6SN7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 82 74 for Tube One and 84 74 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have short bases; white silkscreening; side horseshoe getters; copper support rods and great flashing. Their date provenance codes are 3 22 188 5 and 4 39

This matched pair of RCA 6L6GC output tubes was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

These tubes have excellent frequency response

This new old stock-testing Svetlana 6550B / 6P27 perforated plate output tube was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -48 volts for shorts

new in box Hytron 1N5 1N5GT tubes tested to spec on our Paul Hart-calibrated TV7/U

32/28 and 32/33 where minimum (65%) is 25/25 and 100% is 39/39

new in box US-made 6B8 tubes tested to spec on our Paul Hart-calibrated TV7/U

These five Ken-Rad number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

low-noise E88CC / CV2492 / 6DJ8 / ECC88 OTK dual triode was tested on our Paul Hart-modified TV7/U for shorts

These tubes have black

This is a lot of seven miniature

new in box RCA 12AF3 tubes tested to spec on our Paul Hart-calibrated TV7/U

This hardcover book is in good condition