RATED THE "BEST SOUNDING" CCa EVER MADE
ACTUAL PICTURE OF SINGLE TUBE YOU WILL RECEIVE, TESTING:
tube 1:
22.4mA and 14,400 mA/V 148%
22.0mA and 14,360 mA/V 148%
NOS TUBES TEST AVG. 12,0mA and 11,000 mA/V for this early year.
THE ACID-CODES ARE NOT IN THE GLASS in THESE EARLY VERSIONS ( and of course NOT stamped on tags)
THESE PRE-DATE ACID-CODES and the codes were "painted" on the front of the glass.
From the Tubemuseum Vaults - A REAL Archeological find ... 1959 Siemens Halske with VERY RARE "O" Getters with Gray Electro-Static Shield-Plates CCa. "Rarest and most sought after CCa, has "gray 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 6922 - 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 / 6922 - the HOLY-GRAIL of the E88CC family and the MOST DESIRABLE 6922. CERTIFIED ULTRA-LOW-NOISE PHONO-GRADE SPECIMENS - Manufactured in Munich Germany almost half a century ago! Low Noise early 1960 Siemens & Halske CCa = 6922 - THE BEST! Display the matching "painted on glass" early version codes: 031003 and 031003 = 1959 Price is for a Balanced Matched Platinum low-noise pair. No Gas, and zero (0) uA heater-to Cathode (H-to-K) zero leaks Fixed Bias Readings tested @ 100 eP % of the Balanced Matched, Platinum Low Noise "Best Quality" Siemens CCa = E88CC/6922 This tube is known for excellent performance, smooth highs, outstanding 3-D holographic soundstage, lots of open-air, inner detail, and overall perfect resolution and balanced sound. Improved dynamics, frequency extension accross the spectrum are immediately obvious, making the music sound much more accurate and real. A major improvement over other E88CC / 6922's Make sure you are buying Real Siemens Halske CCa = E88CC / 6922 tubes - They have the double-stage getter frame-grid construction, Gray separator or Gray Electro-static shield, 4 seams on top and numbers in the glass between the pins and the Siemens & Halske S+H logo on the front of the tube. "...If you haven't yet experienced 15mA (100% mA+) per triode CCa = 6922'S you don't know what you have been missing. Instruments seem to come out of the wood-work, you hear harmonies, musical energy & subtle Nuances which you haven't heard before, and without these you may never hear them ..." CCa = LOW-NOISE E88CC "6922" = PREMIUM QUALITY GOLD PIN E88CC: The "CCa" is an E88CC specially selected for "Post Germany" in the 1950's -60'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.
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…"The harmonics of an amplifier can be revealed in the distortion measurements. There are two types of harmonics; Even order harmonics and Odd order harmonics. Musical instruments naturally create lots of Even order harmonics. So do single-ended amplifiers BTW. However, I can't think of too many things in nature that create sound with Odd Order Harmonics, except for solid state and tube push pull amplifiers! This is why you don't get an organic sound from these types of amplifiers, and why everyone is so gaga over Single ended designs.
This works by simply playing a single tone at 1kHz and measuring the echo! You can see that the first harmonic (A) is at 3kHz - an ODD number. The next (B) is at 5kHz and the third (C) is at 7kHz. This is what an ODD Order Harmonic signature looks like. Notice there is no even order content whatsoever. Also of interest is the average noise floor seen between the test signal at 1KHz and 20kHz is about -110dB. (larger numbers are better). Considered very good this noise level is brought to you by a Balanced XLR solid state push pull power amplifier."...The new tubes made today in China and Russia only reproduce 'odd' harmonics - that’s why everyone upgrades to a vintage made tube made decades ago when these rare 'earth-metals' were available in the inner construction of the vintage tube
THE "TOTAL SOLUTION" Siemens Halske E88CC 6922 for proper "odd" and "even" harmonics reproduction
FOR PROFESSIONAL USE ONLY
Low-Noise Tested Microphonic Free
No H-to-K Leakage (Heater-to-Cathode) No leaks (0) zero!
TESTED IN THE "FIXED-BIAS" MODE most similar to Hickok settings
Actual tubes were tested on the State-of-the-Art AMPLITREX AT-1000 Electron Tube Test System
CERTIFIED ULTRA-LOW-NOISE NON-MICROPHONIC SPECIMEN
TubeMuseum tested tubes takes the guesswork out of the process of selection delivering you the best Audio tubes that there possibly can be.
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