gibosi
Headphoneus Supremus
- Joined
- Oct 18, 2012
- Posts
- 6,445
- Likes
- 4,879
What I am finding is a much longer manufacturer code+numeric postamble that became the date code. No mention of 2 letter date codes for Tung-sol tubes, here's what I found:
The first describes the 6 digit mfgr (322 for Tung-sol)/date code scheme, the 2nd has links to the articles I'll include below, that further expand the lists of mfgr codes, IDK about date codes...
https://community.klipsch.com/index...ung-sol-tubes/&do=findComment&comment=2230674
Do these 3 articles combined have enough info to decode the 6 digit Tung-Sol Code?
https://community.klipsch.com/index...ung-sol-tubes/&do=findComment&comment=2231049
http://www.triodeel.com/eiacode.htm
https://www.tubemuseum.org/SearchResults.asp?Cat=30
http://www.tubemaze.info/deciphering-european-tube-date-codes/
So I wonder if @bcowen has a Tung-Sol labeled 6520 made by RCA with RCA date code NF, for June 1963, from the chart I posted back a few posts from here...
Is this an example of RCA made 6520 tubes labeled as Tung-Sol?
It seems that you really really want the date code on that 6520 to be an RCA date code!
But unfortunately there is nothing new in the links you have posted.....
I think the simplest explanation fits the facts the best. To my knowledge RCA never made a 6520, but Tung-Sol did. So that 6520 was manufactured by Tung-Sol, not RCA. And then I think you insult all the many talented people who worked at Tung-Sol by implying that they were either too lazy or not capable of devising a date-code system tailored specifically to the needs of Tung-Sol? Again, TS devised this system and it is theirs and theirs alone. But unfortunately the key to deciphering these codes is not known to me....