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Siemens Halske CCa
Siemens Halske CCa

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Product Code: SH_CCA_SINGLE

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From the Tubemuseum Vaults - A REAL Archeological find ... Early 1970's Siemens Halske with VERY RARE "O" Getters with Solver Electro-Static Shield-Plates. "Rarest and most sought after CCa, has "silver shield" or "grey shield" between plates, Most realistic sounding holographic soundstage, pure seductive sonic joy, complex symphonic images emerge effortlessly" - quote from the tubemuseum review.  Audiophiles vote these as the best-sounding Frame-Grid Construction CCa - even better sounding than Telefunken!  These tubes are known for excellent performance, smooth highs, inner detail and overall resolution and balanced sound.  Revered by many as one of the MOST DESIRABLE CCa - the HOLY-GRAIL of the E88CC family and one of the MOST DESIRABLE CCa.  CERTIFIED ULTRA-LOW-NOISE PHONO-GRADE SPECIMENS - Manufactured in Munich Germany almost half a century ago! Low Noise CCa - THE BEST!

The "CCa" is an E88CC specially selected for "Post Germany" in the 1950's -70's, they were a special low noise, low microphonic, long-life E88CC / 6922.  Philips had similar "designations" for the "Dutch Post", some tubes that were selected had "PTT" * and "BP" lettering or etched designations, but they were the same as a top specification E88CC.  The "German and Dutch Post" consisted of telephone, telegraph, telex, and the postal system "tube" technologies which required LOW-NOISE E88CC / 6922.  A CCa is the same as a 6922 but was tested and certified with high mA, RP, and Mu and lowest-noise audio threshold - the same proceedure the Tube Museum New York certifies tubes by today.  Much of the telephone centrals used vacuum tube technology equipment for telephone equipment requiring a "noise-free" enviroment.  The letters "CC" probabably equates to "double triode", and for a special low-noise design - the "frame-grid" inner construction, which was actually invented by Amperex USA, and became ubiquitous - Present, appearing, or found everywhere in the 6922/E88CC design of the day, including Siemens Halske, Telefunken, Amperex, Philips, and many others.  Internally the inner construction of the CCa is identical to Siemens Halske E88CC - why? Because the only difference is the cosmetic-lettering and ofcourse the "special selection" of the best and quietist specimens.  In addition, the suppliers of the day, wanted a sure method of identifing the tubes they provided, as the very tubes sold to these companies. It could have been very easy to swap with a current different E88CC in the day, if it wasn't uniquily labeled, simply by walking down to the local radio shop and purchasing a different tube.  The CCa factory markings identified the original supplied tubes as the ones guaranteed by the Siemens "Klingarm" Division ( "Klingarm" is the term for low microphonics. You often see Telefunken EF12K or AC701K, the K means Klingarm) whom charged a premium for selected low-noise high mA specimens for industrial customers.

* Pneumatic tubes controlled by vacuum tube amplifiers (or capsule pipelines or Lamson tubes; also known as Pneumatic Tube Transport or" PTT" in the 1950's-60's PPT systems were vacuum tube controlled) In the 1960s, Lockheed and MIT with the United States Department of Commerce conducted feasibility studies on a vactrain tube powered by ambient atmospheric pressure and "gravitational pendulum assist" to connect cities on the East Coast of the US.
  • 1970's Siemens & Halske CCa 6922 E88CC Gray Shield

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