The Reference 6SN7 Thread

[JTbbb]

I’ve been told since they are 1940’s

So which they really are I don’t know. I will post more pictures if someone out there wants to have a go at dating them?

 

[UMN]

Interesting. I don't know the significance of this small sample size, but if you take a quick look on eBay, currently the white letter pairs of Sylvania VT-231 for sale far outnumber the green lettered pairs.

 

[u2u2]

I’ve been told since they are 1940’s

So which they really are I don’t know. I will post more pictures if someone out there wants to have a go at dating them?

Look like they are the mates to what resides in my WA22 at present. 1944 if I understand the system correctly. Very nice performing tubes, among my favourites. Enjoy.

 

[JTbbb]

Look like they are the mates to what resides in my WA22 at present. 1944 if I understand the system correctly. Very nice performing tubes, among my favourites. Enjoy.

Yes 1944 is the date I was given. And yes nice sound.

 

[TLO]

Found it.

Sorry for the delay, tubes look good. Looks like 1950's, 2 hole black T plates, with mica spacers, flashing third of the way up the tube. Mica is not turned down, so probably not a "bad"boy, but the white lettering is not as common as the green lettering. THe JAN just indicates a military number. I have a pair of these as well. Work well,

These were the tubes.

Yes, they are 1940s. A4 = Jan 1944, B4 = Feb 1944. Just sold a pair of Jan 1944, mint condition, to someone today...

 

[Tension250]

Hi guys,
I got some Sylvania 6sn7GT vt231 1945 for my Freya+ these days. I am not sure what I have received. Can someone help to take a look? I spent about 400 Dollars on them. - matched, low noise balanced. There are so many versions of 6sn7GT Sylvania........how can I know these are from 1945?

 

[JTbbb]

Hi guys,
I got some Sylvania 6sn7GT vt231 1945 for my Freya+ these days. I am not sure what I have received. Can someone help to take a look? I spent about 400 Dollars on them. - matched, low noise balanced. There are so many versions of 6sn7GT Sylvania........how can I know these are from 1945?

They look cosha to me. More pics would help though.

 

[u2u2]

Hi guys,
I got some Sylvania 6sn7GT vt231 1945 for my Freya+ these days. I am not sure what I have received. Can someone help to take a look? I spent about 400 Dollars on them. - matched, low noise balanced. There are so many versions of 6sn7GT Sylvania........how can I know these are from 1945?

If you go back a few posts you will see some info on dating. These are looking like 1942 unless posting more photos points elsewhere. Nice looking tubes.

 

[Renexx]

Hi guys,
I got some Sylvania 6sn7GT vt231 1945 for my Freya+ these days. I am not sure what I have received. Can someone help to take a look? I spent about 400 Dollars on them. - matched, low noise balanced. There are so many versions of 6sn7GT Sylvania........how can I know these are from 1945?

Those V shaped cutouts on the top mica started in early to mid 44s.

You have a letter and a number etched on the glass or sometimes printed on the base.
Which indicated the week and the year.
I can't read those on your picture.

The picture of the mica indicates mid 44 or later for your tube because of v-shaped cutouts.

I happen to get my pair of Sylvania vt-231 today and I made some pictures.

You can see one tube has C4 which is first weeks of February 44 and on the picture of the top you can see the 43/early 44 mica construction without v-shaped cutouts.

It's time to listen to those badboys tonight

 

[Renexx]

They glow very nicely

Sound might be just the same like my Sylvania 1953 chrome domes .

Very airy highs, lush midrange, tight low end (Bendix 6080s + Vérité closed give them low end grunt).
Great soundstage and resolution.
Really makes female vocals shine!

 

[HTSkywalker]

Hi guys,
I got some Sylvania 6sn7GT vt231 1945 for my Freya+ these days. I am not sure what I have received. Can someone help to take a look? I spent about 400 Dollars on them. - matched, low noise balanced. There are so many versions of 6sn7GT Sylvania........how can I know these are from 1945?

One thing for sure, OVERPRICED

 

[TLO]

One thing for sure, OVERPRICED

Actually I feel bad for the OP already but didnt want to pour cold water on him since he has already bought them. For USD 400, I would advise him to get SYL 6SN7W instead. Though they are all overpriced but 6SN7W has better value for the SQ you are getting. Anyway, OP is from Europe and I guess he bought them locally, US tubes sell for more in Europe.

 

[JTbbb]

I have acquired a CRC-JAN-6SN7-GT-VT231 Grey Glass tube. I would like to put it into my Euforia AE to check that all is well. At the present time I don’t have another to put with it. However I do have a Tung Sol Jan-CTL-6SN7GT VT-231 Black Glass Oval Mica. Any thoughts as to why I cannot put these two together, so I can check the Grey Glass? I’m expecting another two Grey Glass tubes in about 3 weeks. Should I wait?

 

[FLTWS]

I have acquired a CRC-JAN-6SN7-GT-VT231 Grey Glass tube. I would like to put it into my Euforia AE to check that all is well. At the present time I don’t have another to put with it. However I do have a Tung Sol Jan-CTL-6SN7GT VT-231 Black Glass Oval Mica. Any thoughts as to why I cannot put these two together, so I can check the Grey Glass? I’m expecting another two Grey Glass tubes in about 3 weeks. Should I wait?

I wouldn't wait. If anything you should be able to determine if there is a difference in the sound to your ears, and swap sides to confirm what you hear, or don't.
You'll also know if your new one is a stud or a dud.

 

[bcowen]

I have acquired a CRC-JAN-6SN7-GT-VT231 Grey Glass tube. I would like to put it into my Euforia AE to check that all is well. At the present time I don’t have another to put with it. However I do have a Tung Sol Jan-CTL-6SN7GT VT-231 Black Glass Oval Mica. Any thoughts as to why I cannot put these two together, so I can check the Grey Glass? I’m expecting another two Grey Glass tubes in about 3 weeks. Should I wait?

Yup, @FLTWS is right on as usual. Won't hurt a thing to try it.