Four RCA 6072A tubes, Amplitrex tested. Original boxes and sleeve
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For sale are four RCA 6072A, premium 12ay7 type tubes. These tubes were tested on my Amplitrex tube tester. Tested at 250 plate volts, 3 mA plate current. The new nominal transconductance value is 1700 microhmos. The test sheets in the photos show the results for each tube, including bias volts, transconductance in microhmos, grid leakage, plate resistance, and tube gain. I do not specifically test for microphonics, but do not sell small signal tubes with greater than 0.1uA of grid leakage. Production codes on the tubes: 7430 7335 These tubes ship in the original boxes and include an RCA tube sleeve. Copies of the computerized testing data come with each tube. Sold AS IS. No returns. Payment by Paypal only. Shipping via USPS Priority Mail only. No exceptions. I will combine shipping with other auctions when possible. Payment expected within 3 days of close of auction, or will be relisted. International buyers, please note that all customs documents will include actual purchase price, no exceptions!
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