Telefunken vacuum tube E88CC-TK; NOS versus brand new.

Some nice 12at7wa tubes discovered by myself when I was looking for a cheaper alternative to my rare Telefunken ecc801s military NOS tubes:

National 12at7WA “Pinched Waist” (Matsushita/National)
From tube experts online: “I’ve noticed that tubes from 1958 and earlier have a bigger pinch then tubes from around 1960. Personally. I haven’t seen tubes after 1960 with a pinched waist. The most well known pinched waist tubes are from Philips Heerlen and Valvo Hamburg. They were made mid to end 50s and have the glass pinched around the top mica spacer. I assume this was done to fight microphony. They were only produced for a few years AFAIK and the technique was later abandoned by tube manufacturers. I had always thought the pinching was to clamp the micas in tighter to reduce mechanical vibration of the structure and therefore microphonics.”  

Sylvania Gold Brand 12at7wa (Gold Pins) and National Matsushita 12at7wa are on this image. 

NOS Japanese Matsushita pinched waist tubes are great!  it was direct replacement in my push-pull amp (where the power tubes are rare Telefunken E84L). 

Whatever new tube with an old company logo is nothing but fake, an old (NOS) Telefunken are probably the most expensive tubes and there are good cheapel alternatives (old tubes). NOS 12at7 (ecc801s telefunken) tubes are much better than new (if they are perfect). 

The primary reason for my confidence in stating that, if not for the lower noise floor of the CCa Siemens, the E88CC and E188CC's all sound virtually identical, is the fact that the BAT CDP has allowed me to hear every nuance, of every tube auditioned.   That always held true by changing just one pair, out of the three pairs it takes.     The personality of the BAT was changed dramatically (not a statement I make lightly, or- often), from the Sovteks that were stock, with any NOS tubes I tried.    The closest I ever came, to the presentation of the Siemens CCa, was an early Sixties, Amperex Navy, 7308, pair.    But; they warmed thing up, a bit more than I like.   Bottom line, regarding NOS Siemens; if you want the transparency, texture, freq extension (in both directions) and ambience info recovery of the early CCa (what buyers have valued about them and Teles, for decades): the 88's and 188's will deliver, for a lot less $$.    If you need super low noise (for pre or phono), have them tested.

All of this information is ever so helpful; I am strongly anticipating a change in my present financial condition; that will allow me to try more tubes with your recommendations.

According to the old stories, HP used to hire co-op students to test their E88CC's etc. and reject 98% of them. A percent or two got to bear the HP logo. Those tubes populated the instruments that sent men to the moon.

They sound better than the rest, as you would expect. Used to cost the earth, now no-one remembers what they really were. Major bargain.

Best of all were those made and selected for HP by TFK. I bought a sleeve of E88CC's, three of which still bear the TFK and HP seals. Never heard a tube close to them, and that includes pinched Amperex, TekTronix, etc.