2. vintage
  3. 163402-79323

Any tube experts out there?

Cleaning out and organizing my audio and camera closet I got all the way to the back where I founds something I had long forgotten I had...... bought maybe 15 or more years ago. A pair of Siemens and Halske 6922 CCa Grey Plates with round getter and the following codes.... 34.210 and 32.176. In the dark recesses of my memory I remember buying a few pairs of NOS of these 15 or 16 years ago... pins and writing on the tubes is immaculate, like brand new.
Anyone got an idea what date these are? I had gotten some real beauties from this guy back them.. 1958 Pinched Waist Valvos and other stuff you just didn’t see, even back then..
midareff1
petg60
1,486 posts
 
1962, 1964, these are numbers printed ay the back of the tubes, front is cca.
They should have at the bottom etched codes, A1Φ (series 1 up to 65, 2 up 67 ...and so on) followed by a number noting the year (1,2,3,4,) and after month (letter) and week (number)

G
noromance's avatar
noromance
9,763 posts
 
$75 and that's my final offer.
noromance's avatar
noromance
9,763 posts
 
We used build moving coil head amps using paralleled Siemens E88CC with 24volt B+ from lead-acid batteries. They were the days. 
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tomcy6's avatar
tomcy6
2,587 posts
 
The best I can come up with is that they are pre-1960 CCa:

https://www.tubemuseum.org/SearchResults.asp?Cat=24

For the old "Gray-Plate" early 1960's SIEMENS HALSKE E88CC and CCa:

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

with "painted serial numbers" for the pre-1960 versions

 and ACID-CODES for the 1960 - 1965 versions. After 1966 the acid-codes may change to codes stamped on tiny metal rectangles soldered onto the sides.
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