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For 6AS7G tube rollers here .....
Nov 2, 2016 at 9:26 PM Post #3,781 of 9,579
 
Quote:
gibosi said:
 
mikelap said:
  A couple weeks ago i found this single GEC 6080WA /CV8614 .I am looking out for another one to make a pair is it important to get the same 6080WA/CV8614 markings  or another 6080WA lets say for example GEC6080WA/CV2984  would be ok                                                                                        
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It appears that CV2984, CV5008 and CV8614 all refer to the 6080. I do not know why there are three separate CV numbers for this tube. And I have a pair labeled as a 6080WA (date code SL = 1961). And as near as I can tell, no matter how they are labeled, they are all the same tube.
 
I would suggest that you assume these are in fact all the same tube and instead concentrate on the year of manufacture. The tube pictured above, with a date code of YF, was manufactured in June, 1967. And therefore, if you can find another one manufactured at about the same time, in my opinion, that would be a suitable mate.
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Found this one with code YD =1967 -APRIL but at over $ 225.00 CAD ill forget about it 
 
Nov 2, 2016 at 11:10 PM Post #3,782 of 9,579
Hi Gibosi,
 
The 6080 tube comes in several revisions such as 6080, 6080WA, WB, WC. Perhaps the different CV numbers correspond to different revisions of this tube.
 
I do not know what the revisions are, or if they make any practical difference, but there must be some reason for the differences, probably something minor in the specifications.
 
I do know that the graphite plate tubes usually have a WB designation.
 
Nov 2, 2016 at 11:58 PM Post #3,783 of 9,579
mordy said:
  Hi Gibosi,
 
The 6080 tube comes in several revisions such as 6080, 6080WA, WB, WC. Perhaps the different CV numbers correspond to different revisions of this tube.
 
I do not know what the revisions are, or if they make any practical difference, but there must be some reason for the differences, probably something minor in the specifications.
 
I do know that the graphite plate tubes usually have a WB designation.
Click to expand...

 
The idea that these different CV numbers might correspond to the WA, WB and WC did occur to me, with CV2984 being the earliest and CV8614 being the latest. However, I have a pair labeled 6080WA, dated 1961; Mikelap posted a picture of one labeled CV8614, dated 1967; and I have another pair labeled CV2984, dated 1972. So while it is tempting to think these different CV numbers correspond to WA, WB and WC, the labeling and dates on these GEC tubes just doesn't seem support it.
 
So again, my assumption is that all these GEC variants are the same. And even it they are somehow different, I am inclined to believe that tubes manufactured at about the same time are identical regardless of the label.
 
And yes, Bendix 6080WB have graphite plates, but all the other manufacturers used metal plates....
 
Nov 3, 2016 at 1:05 PM Post #3,784 of 9,579

Here are a few shots from the several matched pairs of GEC 6080 I have. Three different CV numbers (8614, 5008, 2984) yet all look to be physically identical. I have a few pair of driver tubes with similar construction but different dates, likewise with some of my other brands of power tube sets. No issues with their performance. I think the OP will do well to find another GEC 6080 with similar construction and not worry about the CV numbers. Depending on source the price of these tubes in true NOS form have over doubled this year. I suggest email James at Langrex and see if he can fill the need.
 

 

 

 
Nov 3, 2016 at 1:09 PM Post #3,785 of 9,579
u2u2 said:
 
Here are a few shots from the several matched pairs of GEC 6080 I have. Three different CV numbers (8614, 5008, 2984) yet all look to be physically identical. I have a few pair of driver tubes with similar construction but different dates, likewise with some of my other brands of power tube sets. No issues with their performance. I think the OP will do well to find another GEC 6080 with similar construction and not worry about the CV numbers. Depending on source the price of these tubes in true NOS form have over doubled this year. I suggest email James at Langrex and see if he can fill the need.
 

 

 
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They have them but they are way to expensive 
 
Nov 5, 2016 at 9:12 PM Post #3,788 of 9,579
Hi thebrunx,
 
RSD was a German rebrander that in later years put their name on Russian and Eastern Europe tubes.  The tip-off on the Russian 6AS7 type tubes are the dual inverted saucer getters, Can't see clearly in the picture, but I am sure that Gibosi is right.
 
Very recently a whole bunch of Russian Svetlana 6AS7/6H13C/6N5S  have appeared under fake names such as Amperex  - Made in Holland, and United National -  Made in England.
 
Nov 9, 2016 at 8:26 PM Post #3,790 of 9,579
Bought a couple of RCA 6AS7 tubes cheap and included in this lot was a Tung Sol 6AS7G from March 1965. It does not look the same as my Chatham 6AS7 which have clear tops and copper rods. The writing on the base does not have the regular TS factory numbers and just says JAN 6AS7G Tung Sol Made in USA. This TS tube has a top getter flash as well as a side getter flash on the bottom.
 
nRDR6hZSgde6ZJM3ES_DTR5UmD2zybARkhg3rFocfKKqLdGfhqxf5hdA-h-xh28YQJzJ3W1UAxP1-yQ=w3838-h2158-no

bM1Bn3WCWYkriZlmSAAJcXjnmL-yinHKM6aUEGuEuca916xD_yeR5Dx1KS0-J-a_9L3L3HoSFUF-FeY=w2400-h1350-no

 
Do you think it is a Tung Sol tube or a RCA rebranded tube? (The construction does not look the same as the RCA 6AS7G).
 
I sounds nice with a nice weighty bass.
 
Nov 9, 2016 at 9:18 PM Post #3,791 of 9,579
My guess is that it is a Tung-Sol 6AS7. While I don't have any TS 6AS7 from the middle 1960's to compare, I do have a couple pairs from the middle 1950's. And it is reasonable to assume that over that ten year period, changes were continuously being made in the design and construction of this tube.
 
For comparison purposes, most Chatham/Tung-Sol 5998 from the middle 1950's had top getters. And around the middle 1960's, we begin to see 5998s with both top and side getters. So it may well be that Tung-Sol came to believe that a top getter plus a side getter gave better results, and this is reflected in mid-to-late 1960's 5998 and 6AS7.
 
But as usual, this is pure speculation in my part. lol :)
 
Nov 9, 2016 at 10:03 PM Post #3,792 of 9,579
Hi G,
 
Thanks for your answer - your assumptions sound very reasonable. I assume that making a tube with two getter locations would make the manufacturing more complicated/expensive,so there must be a reason for it.
 
Looked through a bunch of pictures on Google of TS 6AS7 tubes, but I could not find a single one with red print on the base - that's why I asked if it is a RCA, but it does not look like the RCA tubes.
 
Nov 13, 2016 at 12:08 PM Post #3,794 of 9,579
Hi attmci,
 
Good find - the third tube in the first picture (without name brand) could possibly be a GEC 6080. If the Raytheons were Bendix rebranded tubes (they are not) I would bite.....
 
Found a picture:
 
0FF6621086FF0134D255543D7EF8F2BE.jpg

 
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