Matched, Tested & Guaranteed Vacuum Tubes
All tubes are guaranteed to be 100% as described or your money back. All tubes have been tested for mutual transconductance, shorts, leaks, gas and noise on my calibrated Hickok TV-7/U.
Any pair of quad described as matched means that the tubes will have the same exact construction and will test within a close range of each other for Mutual Transconductance. The last criteria is date codes, which I do match when possible.
Number of Tubes:1
Plate Construction: Black Smooth
Getter Construction:Top 
Visible Date Codes:0
Mutual Trans Test Data: 1450 where the minimum good reading is 1196 and the New Old Stock (NOS) reading is 1840.
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