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Matched Pair RCA 12SL7 12SL7GT Vacuum Tubes Valves Mosaique Une Enfance copiously-illustrated book is in excellent

$30.00

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copiously-illustrated book is in excellent condition

This trio of Wards type 76 triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Tube One (Philco-LABELED

new in box GE 12FX8A tubes tested to spec on our Paul Hart-calibrated TV7/U

5 or so out of ten

Matched Pair RCA 12SL7 12SL7GT Vacuum Tubes Valves Mosaique Une Enfance copiously-illustrated book is in excellentThis matched pair of RCA 12SL7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 41 49 for Tube One and 44 44 for Tube Two where minimum (65%) is 32 32 and 100% is 49 49. These tubes have excellent flashing; dark, gray plates and bottom, dimpled sheet getters. Both tubes were made in the same factory just as RCA bought out Cunningham. They are

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