Matched Pair RCA 7B7 Vacuum Tubes 17AY3A T31 T55 new in box US-made 12HL7
$11.31
Description
new in box US-made 12HL7 tubes tested to spec on our Paul Hart-calibrated TV7/U
Transconductance: 2200 micromhos Transconductance: 2270 micromhos
Listening report to follow
This set is supposed to contain three LPs
new in box matched pair of JJ low noise 12AX7 / ECC83 / 12AU7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts
Matched Pair RCA 7B7 Vacuum Tubes 17AY3A T31 T55 new in box US-made 12HL7This nearly perfectly matched pair of RCA 7B7 tubes was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 60 for Tube One and 61 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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