[billerb1]

Selling the grey shield Siemens E188CC's.  Ebay seller said they were late '50's.  Can't verify that.
$139 plus $12 for USPS Priority shipping.  I'll eat the paypal fee or do friends/family.  Ship to CONUS only.
Here's the for sale head-fi listing.  PM me...
 
http://www.head-fi.org/t/833608/siemens-grey-shield-e188cc-matched-pair
 
Here's the original ebay listing:
 
http://www.ebay.com/itm/2-tubes-Siemens-CCa-E188CC-7308-6922-71-5-grey-plates-matched-pair-/112264649328?nma=true&si=Rn9ptRImOIFgh9ATUpva8RikC9s%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

 

[winders]

  Selling the grey shield Siemens E188CC's.  Ebay seller said they were late '50's.  Can't verify that.
$150 plus $12 for USPS Priority shipping.  I'll eat the paypal fee or do friends/family.  Ship to CONUS only.
Here's the for sale head-fi listing.  PM me...
 
http://www.head-fi.org/t/833608/siemens-grey-shield-e188cc-matched-pair
 
Here's the original ebay listing:
 
http://www.ebay.com/itm/2-tubes-Siemens-CCa-E188CC-7308-6922-71-5-grey-plates-matched-pair-/112264649328?nma=true&si=Rn9ptRImOIFgh9ATUpva8RikC9s%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

What are the contents of the 3 lines etched into the glass tubes? For example, on one of my CCa tubes there are these etchings in the glass:
 
A0
1≠
4F

 

[thecrow]

What are the contents of the 3 lines etched into the glass tubes? For example, on one of my CCa tubes there are these etchings in the glass:

A0
1≠
4F

http://www.audiotubes.com/mullcode.htm

I beleive:

A0 is the type of tude (e88cc, 6922,etc)
1=/ is that it was priduced in siemens halske Munich factory
4f is 1964, June

I beleive sometime in 64 (maybe 65) they changed the placement of the codes from the glass on to the getter support

From a distant memory i have iit as the AO or 1=/ also specifically signified cca but dont hild me to that

Then i beleive later on the AO would become A1 , A2, A3,etc due to revisions or batchez and later, maybe '66 the middle line was dropped off. Dont hold me to that either

 

[winders]

http://www.audiotubes.com/mullcode.htm

I beleive:

A0 is th type of tude (e88cc, 6922,etc)
1=/ is that it was priduced in siemens halske Munich factory
4f is 1964, June

I beleive sometime in 64 (maybe 65) they changed the placement of the codes from the glass on to the getter support

I read, in that same link, that Siemens starting putting the codes on the getter support after 1968. Yes, the tube I listed was made in in the Siemens Halske factory in Munich on June of 1964.
 
It seems that Siemens used "A0" for both the E88CC and E188CC tubes.

 

[TK16]

I got a pair of "G0" E188CC`s, also seen some marked "A0" as well. Metal plates started later part of 1965, do not care what Brent says.

 

[winders]

  I got a pair of "G0" E188CC`s, also seen some marked "A0" as well. Metal plates started later part of 1965, do not care what Brent says.

The later part of 1965 makes sense based on this photo:
 


Those tubes can't be from 1975!

 

[winders]

I just did more research on this. The 3 line code was stamped on the getter support starting in later half of 1965. In 1966, the 3 line code was reduced to 2 lines. So there you go!
 
Also, the E188CC tubes normally would have a "G" code instead of "A" which is for the E88CC or CCa tube. The number after the letter is the revision number for that year.

 

[thecrow]

I like the idea of codes on the plates inside the tube - pretty hard to duplicate/make a counterfeit

 

[billerb1]

My E188CC's are definitely prior to 1965.  No engraving on the getter support.  But I see nothing on the glass.  They look very much like my '61 grey shield Cca's.  They are either late '50's like the ebay seller said or early 60's.  My guess anyway.

 

[spyder1]

  I got a pair of "G0" E188CC`s, also seen some marked "A0" as well. Metal plates started later part of 1965, do not care what Brent says.

TK16,
 
G0 is charactistic of E188CC, A0 is E88CC, and CCa. Is A0 labeled E188CC a mislabeled CCA?

 

[winders]

 
TK16,
 
G0 is charactistic of E188CC, A0 is E88CC, and CCa. Is A0 labeled E188CC a mislabeled CCA?

Or a miss-stamped E188CC? 

 

[spyder1]

 
Or a miss-stamped E188CC? 

​An interesting gamble, for the right price.

 

[winders]

  My E188CC's are definitely prior to 1965.  No engraving on the getter support.  But I see nothing on the glass.  They look very much like my '61 grey shield Cca's.  They are either late '50's like the ebay seller said or early 60's.  My guess anyway.

I see etchings on the left tube in the eBay photos. I can even see the "1≠" on the left tube in the photo showing the back side of the tubes. You don't see that on your tubes?

 

[billerb1]

 

  My E188CC's are definitely prior to 1965.  No engraving on the getter support.  But I see nothing on the glass.  They look very much like my '61 grey shield Cca's.  They are either late '50's like the ebay seller said or early 60's.  My guess anyway.

I see etchings on the left tube in the eBay photos. I can even see the "1≠" on the left tube in the photo showing the back side of the tubes. You don't see that on your tubes?

 
No

 

[winders]

Hmm. It would appear the photos used for the auction are not photos of the tubes you received. I wonder if the seller does that often. I bought two tubes from him but they have not arrived yet.