Perfectly MATCHED VINTAGE QUAD of very nice, strong & early 1960’s Telefunken diamond bottom (in glass) factory 12AX7  / ECC83 tubes. These are all from the late 50's or early 1960's. They are beautiful examples of the very old 17mm tall, SMOOTH plates.  All 4 pieces have  been MATCHED / BALANCED for GM & Plate Current  on Digital Lab Tester @ full 250V!  Emissions test shown below for easy reference -- all sides are over 120% dynamic emissions. (see full lab test reports for GM & plate current below, exhibit b,c,d). The QUAD Tested strong and quiet on multiple testers. Quiet to ear -  No microphonics.  They're guaranteed NO DOA,  and your happiness with these is assured!! 

 These West German tubes have long set the standard for 12Ax7 dual triodes ... a very clear, detailed and absolutely one of the smoothest 12ax7's you can own. Genuine Tele's go forever as well, outlasting most other brands of the era. 

Study the large photos & reports below, and you can see they are genuine Tele tubes and in great, matched shape!  

Strong tubes, and they sound great, tested in a hifi audio amp.

 Gourgeous Tele's. The flashing is beautiful & shinny, pins are straight. Ink is partial (exhibit C) or missing,  other (2) tubes have nice ink (see exhibit D). The units are matched construction and have diamonds in glass. These are strong tubes ..checked in amp and sounding wonderful. Likely the most throughly tested set now on ebay. And you don't see a a near perfectly QUAD matched set of tubes like this very often. They will sell quickly, so buy now to avoid a bidder's war! 

Careful double box packing and fast shipping. 

See feedback, all happy 100% customers on these vintage tubes!