Matched Pair Sylvania 7B7 Vacuum Tubes 6H6 Octal This tube has a bottom
$13.32
Description
This tube has a bottom D getter and an E9M date code which means it was likely made by Sylvania
Transconductance was 1670 for Tube One and 1570 for Tube Two where new/nominal is within one standard deviation of 1900
where minimum (65%) is 36 and 100% is 55
They may be Chinese
These six new old stock-testing
Matched Pair Sylvania 7B7 Vacuum Tubes 6H6 Octal This tube has a bottomThis nearly perfectly matched pair of Sylvania 7B7 tubes 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 59 for Tube Two where minimum (65%) is 43 and 100% is 66. They have mica snubbers for increased vibration resistance and lowered microphonics and great flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT.
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