NICE VINTAGE QUAD of very nice, strong early 1960s era Telefunken  12Ax7 (see beautiful photos of glass - exhibit E)  17mm ribbed ECC83 tubes. These are all from the 1960's . All are beautiful early examples of Telefunken produced tall, late 50s to early 60s ribbed plate design. 

The 17mm ribbed plates directly (and were for a period manufactured concurently) followed the 17mm smooth of the late 1950s...these original tall ribbed Tele's have some very positive sound attributes that the earlier German tubes don't always offer ...read on...

You will of course find the famous "diamond" bottom on these...  note Exhibit D and F. These tubes are genuine West German production, Telefunken made tubes early to mid 1960s. This feature typical amazing Teleunken quality, thick top halo getter, smooth, thick shinny top flashing, tall heavily built plates and beefy mica supports.

 The sound of these tall ribbed plates is really nice. Guitar players often favor them over the tall/smooth plate Telefunken of the late 50s -- the breakup is crisp. Audiophiles also choose them sometimes over 17mm smooth of the late 1950s ....when you need crisp, midrange presence in the forefront.... like the 17mm smooth these tubes last a long time, durable and one of the worlds quietest 12ax7 types. 

The sound is definately Telefunken pedigree, with all of that creamy, lush sweetness -- but .. with brighter more defined highs compared to the smooth plate. It's a choice, and once you own the smooth plates, you'll also want to add a set of ribbed type to your collection ( and vise versa).

If your past audiophile experience was with the tall 17mm smooth plate variety , give these 17mm ribbed beauties a try  ... you may well like the delicate top end. For those who love the incredible long life that early german tubes give -- but found the smooth plate too rich or dark ... give these a try. These have the old world quality and will give any 12ax7a/Ecc83/7025 equipment wonderful definition in the vocal region. 

 All 4 pieces test well MATCHED for GM & Plate Current readings on Calibrated Lab Tester at the full, fixed bias 250V. Study the photos below ... it's the best matching set of these you'll see anywhere.  

A 4pcs are STRONG, test range 115% or better of new on ALL sides, they are low hours examples.  (see exhibit B)

 As found amongst a cache of stored spares, from a HiFi estate, in are old Telefunken boxes. The boxes are old and show many stains due to age (exhibit A, H). The early Telefunken tubes inside look beautiful and sound wonderful. 

Emissions test shown below for easy reference -- all sides are over 115% dynamic emissions. (see full lab test reports for GM & plate matching data below, exhibit A,D,E,H). The QUAD Tested strong and quiet on multiple testers. And, played in preamp....quiet to ear -  No microphonics. 

  They're guaranteed NO DOA,  very much happiness with these nice old tubes is assured!! 

 These are the classics;  West German of the 1950s & 60s have long set the standard for 12Ax7 dual triodes ... a very clear, detailed sound come from these ... and absolutely one of the silkiest, sweetest 12ax7's you can own.  Plus, genuine early Tele's go forever as well, outlasting most...other brands of the era.  (they have superior build quality which equates to incredible lifespan) 

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

Strong tubes, and they sounded great, when tested in a hifi audio amp -- QUIET and WONDERFUL..

 Gourgeous Tele's. The flashing is beautiful & shinny, pins are straight. White Ink, clearly marked West Germany (exhibit A,E), a couple of tubes  may have partial or missing ink,.. see descriptions below...  

The units are matched construction, 17mm ribbed, top halo, and have (exhibit D,E,F,G) .

Likely the most throughly tested set now online ... anywhere ... especially stateside ... and so throughly checked out & fussed over QUARTET, all made during the very early 1960s..

A QUAD matched set like this is irresitable to both the collectors and audiophiles .... all over the world.  These will surely sell quickly -- Buy now to avoid a bidder's war.

Always carefully double boxed, and fast shipping with tracking #. 

Please see our excellent feedback, all happy 100% customers on vintage audio & tubes!