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The 6SN7 Identification Guide
Oct 23, 2020 at 1:31 PM Post #316 of 529
JTbbb said:
Thank you for your help JKDjedi, and yes indeed they sound very nice.

JKDjedi, how do you know the approximate date? Is it from the construction or the code? Just curious.
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VT231 tubes are wartime tubes. The war ended in 1945. we would need a seasoned member here to decipher the code stamped on that tube. :) Did a quick search for ya.. most likely 1944 from the codes
 
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Oct 23, 2020 at 1:36 PM Post #317 of 529
JKD is correct. While I'm not an expert, but the VT-xx numbers, which I read are stock numbers, typically indicate WWII vintage. JAN is military - "joint army/navy" I think, but not necessarily WWII. But the military requirements generally called for more durable builds, less prone to vibration (think fighter planes). Also go back and read the beginning posts of this forum or https://www.head-fi.org/threads/the-reference-6sn7-thread.117677/.

Also may be of help...
http://www.dehavillandhifi.com/6sn7_vt.htm
https://www.head-fi.org/threads/shootout-of-nos-6sn7-tubes.932083/
http://www.audiotubes.com/6sn7.htm
and...



In addition, the 6F8G is an excellent and often less costly equivalent, actually the 6SN7's predecessor, but they do require an adapter to plug into a 6SN7 socket (eBay from China or Woo Audio).
 
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Oct 25, 2020 at 1:49 PM Post #321 of 529
From Wikipedia:
American military designator for the 6SN7GA is VT-231, and the British called it CV1988. European designations include the 1942 ECC32 (not an exact equivalent), 13D2 and B65.

Tung-Sol had a version in the 1940s: http://www.vacuumtubes.com/6sn7.html

Btw, these are the kinds of questions that I learned a lot about from scratch doing searches and poking around online.
 
Oct 25, 2020 at 1:56 PM Post #322 of 529
JTbbb said:
Ok, I’ll try again :). I know there will be a Tung Sol 6SN7GT VT-231, but is there a Tung Sol 6SN7 VT-231?
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copy, from a quick looks, I don't think there ever was a Tung Sol 6SN7 (VT231).. just the 6SN7GT (VT231) Since these were all built in the 40's, I can not find any 6SN7 Tung Sol anywhere of any reference on the internet, interesting. Anybody?
 
Oct 25, 2020 at 1:58 PM Post #323 of 529
highstream said:
From Wikipedia:
American military designator for the 6SN7GA is VT-231, and the British called it CV1988. European designations include the 1942 ECC32 (not an exact equivalent), 13D2 and B65.

Tung-Sol had a version in the 1940s: http://www.vacuumtubes.com/6sn7.html

Btw, these are the kinds of questions that I learned a lot about from scratch doing searches and poking around online.
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Thank you. I am learning a lot, it’s fascinating. Just the occasional dumb question!
 
Oct 30, 2020 at 11:51 PM Post #327 of 529
highstream said:
From Wikipedia:
American military designator for the 6SN7GA is VT-231, and the British called it CV1988. European designations include the 1942 ECC32 (not an exact equivalent), 13D2 and B65.

Tung-Sol had a version in the 1940s: http://www.vacuumtubes.com/6sn7.html

Btw, these are the kinds of questions that I learned a lot about from scratch doing searches and poking around online.
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Ecc33
 
Oct 31, 2020 at 8:02 AM Post #329 of 529
Oct 31, 2020 at 8:41 AM Post #330 of 529
Hello there, my most recent purchase is a pair of these. I guess they are what might be called type 1’s as there are just 2 support rods? Do the numbers give the date of manufacture? Or can it only be tied down to 40’s? Or 50’s

230F3A2F-9DD1-41EA-A538-F5DE6E9F971E.jpeg
583826F7-86DB-471E-BCB2-D4E5DE6C3372.jpeg
 
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