Selling a very rare RCA 12AU7 tube.I have done extensive research on this tube and have determined that is was manufactured in the '50s. It features a tilted square halo getter, spot-welded to the plate. It also features ribbed black plates and triple mica construction. Unfortunately, the only lettering still visible is the classic stop sign logo with 12AU7 within the logo. The tube tests 93/94 on my calibrated EICO 667 tester, where 82 is Good. There are no shorts, leakage or gas. Please review my feedback and purchase with confidence.
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