Matched, Tested & Guaranteed Vacuum Tubes
All tubes are guaranteed to be 100% as described or your money back. We are known for our excellent customer service! All tubes have been tested for mutual transconductance, shorts, leaks, gas and noise on one of our calibrated Hickok TV-7 tube testers.
Any pair or 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 matching criteria is by date codes, which we do match when possible.
Actual Brand: RCA
Printed Brand: RCA
Type: 5963 [Long Life 12AU7]
Number of Tubes: Matched Pair
Plate Construction: Black Ribbed
Getter Construction: Top  Foil Strip
Visible Date Codes: 57-03 & 56-52 PT
Lettering Condition: Average
Box Included: 2 Boxes-Not Original
Tests NOS: No
Actual NOS (Some Tubes Test NOS but have a few hours on them): No
Mutual Transconductance (Gm) Test Data: 56/66 & 66/66 where the minimum good value is 48/48 and the New Old Stock (NOS) value is 75/75 or 75/88% & 88/88% of what a new tube should test
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