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Matched Pair Ken-Rad 6SJ7 Vacuum Tubes NOS-Testing 1st Quarter BW10 new in box Sylvania 9JW8

$256.05

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Description

new in box Sylvania 9JW8 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box Amperex 6EA7 / 6EM7 tube tested to spec on our Paul Hart-calibrated TV7/U tube tester

new in box Sylvania 12JT6A tube tested to spec on our Paul Hart-calibrated TV7/U

They tested (from left to right

The dust jacket is pretty nice

Matched Pair Ken-Rad 6SJ7 Vacuum Tubes NOS-Testing 1st Quarter BW10 new in box Sylvania 9JW8This new old stock testing, perfectly matched pair of Ken Rad 6SJ7s was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 58 for Tube One and 58 for Tube Two where minimum (65%) is 40. They have E5E and E5E date codes, respectively. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. They are microphonic and are fine in the preamp

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