[Makiah S]

Using a 1958 FOTON 6N8S [600mA] XII-58 with a 6SN7/6DJ8 adapter. It counts right?

How's it sound? Price on those is pretty low $25 for a pair shipped

 

[chef8489]

How's it sound? Price on those is pretty low $25 for a pair shipped

Sounds pretty good. I am really enjoying it with my hd650 right now. Compared to the 1957 Sylvania gtb 6s27, it has deeper more impact-full bass and more forward mids where the 57 gtb has better more detailed highs and bit more separation.

 

[rnros]

I believe that 33S30B is simply the Swedish military number for a 5692. And like all 5692s, it was designed to withstand considerable shock and vibration.

Here is what appears to be the same construction, also made in Sweden by Standard Radio (1969), and labeled Telefunken 6SN7WGTA. 378 Euro.

http://www.tubeampdoctor.com/produc...products_id=1556&mySID=bskOmIhB69Hp5,hcK3EgN0

 

[gibosi]

I have read that some of the later 33S30Bs were in fact, relabeled American 5692s, so closely examining and comparing construction details might be a very good idea....

 

[attmci]

Clearly, the plate stuff, the tripple mica and addded support => military stuff, 10 000hours, vibration and shock. The tube look like the Red Base 5691.

http://m.ebay.com/itm/STANDARD-33S3...3D182671411570&_trksid=p2056116.c100408.m2460

LOL

 

[Makiah S]

http://m.ebay.com/itm/STANDARD-33S30B-Ultara-Rare-6SN7-RCA-5692-1Pair-/192257817783?_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20150519202348%26meid%3D96434d84a1ff4c1a812f06952e84fe84%26pid%3D100408%26rk%3D1%26rkt%3D24%26sd%3D182671411570&_trksid=p2056116.c100408.m2460

LOL

What a joke, they aren't even matched that strongly imo

Tube1 8.5mA 2600/9.1mA 2800
Tube2 8.6mA 2600/8.3mA 2500

I've got a 1944 Sylvania 6sn7 GT that's a solid 2800/2800 at least according to the buyer I got it from, it's sounded better than everything else I've tried... an I even splurged on a green label variant of the same tube... with poor'er matching and it wasn't as impressive sadly

 

[Johnnysound]

I have read that some of the later 33S30Bs were in fact, relabeled American 5692s, so closely examining and comparing construction details might be a very good idea....

 

[pctazhp]

Returning to this nice and instructive thread because I am currently waiting (very patiently) to receive my new FA Euforia amp. And quite frankly, one of the main reasons why I choose this one is because it is designed specifically for 6SN7s , driving 6AS7Gs as powers. My first experience with 6SN7s was years ago with my trusty LD III, (as suggested in the old but outstanding LD thread), in an odd position as power tubes, replacing the truly excellent sounding 6n6p russian tubes.

I started my OTL adventure with LDIV-SE, running C3S drivers. Moved up to Elise and now have had Euforia for several months. I absolutely love it. Hope you will feel the same

 

[gibosi]

Hi Gibosi, good to talk again after quite a while...........

As a side note, I discovered only recently that the 6n6p family is a 100 % original russian design, with no western equivalent, but it is pin compatible with E88CCs, and via a proper adapter, it may be used in a 6SN7G driver position, some said with great results...any experiences ? ..............

BTW, couldn't resist a fair offer of some 11 NOS or very strong testing 7N7, at around 5 bucks each. Many old tall bottles. Will post some pics when received.

Hello Johnnysound. It's good to see you too.

And yes, I have run a 6N6P-type tube, a 6N30P-DR to be exact, in a 6SN7 socket, and it works fine and sounds great. However, the heaters in these Russian tubes draw around 0.8A, which is a bit more than the 6SN7's 0.6A. Since it seems that many, if not most, 6SN7-based amps can provide about 1.0A, in order to accommodate the ECC32, this is likely not a problem. But still, it would be best to double-check with the manufacturer before trying.

Also, the vast majority of 7N7 were manufactured by Sylvania. But once in a while, you might come across one manufactured by National Union. The NU 7N7 have tall bottles, the gray glass extends considerably higher than the Sylvanias, and through the gap between the gray glass and the base, round plates, similar to the NU 6F8G, can be seen. A very nice tube, IMO.

Cheers

Below, Sylvania on the left and NU on the right

 

[attmci]

Hello Johnnysound. It's good to see you too.

And yes, I have run a 6N6P-type tube, a 6N30P-DR to be exact, in a 6SN7 socket, and it works fine and sounds great. However, the heaters in these Russian tubes draw around 0.8A, which is a bit more than the 6SN7's 0.6A. Since it seems that many, if not most, 6SN7-based amps can provide about 1.0A, in order to accommodate the ECC32, this is likely not a problem. But still, it would be best to double-check with the manufacturer before trying.

Also, the vast majority of 7N7 were manufactured by Sylvania. But once in a while, you might come across one manufactured by National Union. The NU 7N7 have tall bottles, the gray glass extends considerably higher than the Sylvanias, and through the gap between the gray glass and the base, round plates, similar to the NU 6F8G, can be seen. A very nice tube, IMO.

Cheers

Below, Sylvania on the left and NU on the right

These are "rare" 7N7. The most popular Syl are OK tubes and worth just about $5-7. Just my 2c.

 

[chef8489]

Today listening to a 57 Sylvania 6SN7GTB. I need more 6sn7 type tubes as I only have 2.

 

[Makiah S]

My favorites are the Sylvania 6sn7GTW Green Label Short Bottle Chrome Dome'd ones, which are a lot of fun! The ones with the most clarity are the Sylvania 6sn7 GT 1944 White Label, tall bottle with a Bottom Getter flash

 

[attmci]

Today listening to a 57 Sylvania 6SN7GTB. I need more 6sn7 type tubes as I only have 2.

http://www.ebay.com/itm/Coppia-valv...828421?hash=item3ae946b545:g:BYMAAOSwYlRZL8n8

These are good.

 

[Oskari]

I believe that 33S30B is simply the Swedish military number for a 5692.

I think 33S30B is the manufacturer's type code. The Swedish military type code would be M2463-252 (possibly with some additional digits).

• Swedish military tube designations

 

[rosgr63]

Quote:

I agree with everything you said EXCEPT that I actually try to FIND amps that use the 6SN7, precisely BECAUSE I have a large stash of them already and I want to use them

6SN7's are not that bad, so many different makes/types to try.