7 Matched Sylvania 7A7 Vacuum Tubes Valves NOS-Testing Lot Of Seven 2 Lot Of Two

7 Matched Sylvania 7A7 Vacuum Tubes Valves NOS-Testing Lot Of Seven 2 Lot Of TwoThis perfectly matched septet of new old stock testing Sylvania 7A7 tubes was tested on our Hickok 800 for shorts, gas and transconductance. There were no shorts or gas and they all measured 2200 micromhos where new nominal is 2000 and minimum (65%) is 1300. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT

Tube One Plate Current Draw: 25

This Majestic number / type 55 tube was tested on our Paul Hart-calibrated TV7/U for shorts gas and transconductance

These six US-made 6S4A tubes were tested on our Paul Hart-calibrated TV7/U for shorts

These tubes have copper support rods

It was made in South Korea

new in box GE 1821A / Z-1879A is still sealed in its plastic baggie

firmly-cemented to their bases

these are what you're looking for

noise or gas and it tested as follows:

Transconductance measured 60

(New 6211s typically test within one to 1

There were no shorts or gas and their readings are as follows: