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6SN7 Tube Addicts - Page 259

post #3871 of 4206

7N7 tube ID request:

 

It is my understanding that only Sylvania and National Union manufactured 7N7. And typically, it is easy to tell them apart -- Sylvania has clear glass and chrome top where as National Union has smoked glass.

 

And this brings us to the tube on the left... shorter than the known National Union on the right, typical Sylvania style chrome top and gray smoked glass. Has anyone seen this tube before?

 

 

post #3872 of 4206
Thread Starter 

Yes indeed.

 

A have a 7N7 selection and have used them briefly but I prefer the 6SN7.

For your LD tube rolling don't forget the 6CG7/6FQ7 which are the 9pin versions of a 6SN7.

It's a great thread, I enjoy it.

 

Here are some of my 7N7 tubes:

 

 

 

 

post #3873 of 4206

Thanks!

 

The middle tube in the bottom row of your bottom picture sure looks to be the same tube. I guess if I can find some time to give it a listen, I should be able to determine if it is indeed an NU. (However, I just got a Tung-Sol RBP and I just can't get myself to take it out of the amp! lol) I was able to spend a decent amount of time with the small bottle Sylvania 7N7 and a 7AF7, and prefer the 7AF7. However, I wanted to try the Sylvania tall bottle 7N7 and the NU to see how they compare. And I also have a number of 6CG7/6FQ7 and felt the Tung Sol 6CG7 with three micas was quite good.

 

Since my tricked-out Little Dot 1+ hybrid amp can roll a variety of double triodes such as 6DJ8, 12A-7, 396A, E80CC, as well as the 6SN7 / 6SL7 (and variants), I am having a right merry old time. :)

post #3874 of 4206

Sylvania 3-hole Bad Boy

 

I recently picked up this Sylvania Bad Boy, relabeled as an Admiral, and dated 1950, week 26. From what I have read, this seems to be too early? I haven't listened to it yet, other than for a couple minutes to ensure it wasn't dead or defective, so I can't say if it sounds the same as the classic 1952 bad boy.

 

Has anyone else seen a 3-hole bad boy this early?

 

 

post #3875 of 4206
Thread Starter 

It looks like a genuine 3 hole bad boy for sure.

I usually run new tubes for 1 hour before I put them away.

 

BTW another tube you might want to try is the ECC40.

I think it will perform well in the LD.

post #3876 of 4206

This looks to be what people call a Sylvania "Chrome Dome": Black 3-hole T-plates and getter flash covering more than 3/4 of the bottle. However, "6SN7GTA", and not "6SN7GT" without the "A", is etched on the top of the bottle, and this contravenes what others have written....

 

 

post #3877 of 4206
Thread Starter 

It does.

I personally like the GTA/GTB type too.

For me this is a great find, a nice tube to have and enjoy.

post #3878 of 4206
Thread Starter 

Happy New Year!!!!!!!!!!!!!

post #3879 of 4206

I have read the same things about Bad Boys i.e. 1951-53 are the usual dates cited, however you can't argue  with construction. It is indeed a 3 hole/rivet Bad Boy.

I have been in contact with Len of 6SN7 renown recently and will pose the question to him.

post #3880 of 4206

Got these recently.  Very good tubes but somehow I dont like the vocals these tubes produces.  The bass is there and clean.  Good soundstage, but the vocals are a bit of a let down.  It sounds lifeless and thin.  Although instrument sounds pretty good.   These are NOS with 8 hours of burning before any listening.  

post #3881 of 4206

they have a stellar reputation. i been trying to find a pair of them reasonably but no luck. Like I need more tube sLOL. I have mostly tungsol tubes 6F8G and  6sn7 for my WA5

post #3882 of 4206

I like the TS 6f8g much much better than these.  Specially the one with round mica.  One thing I noticed about the 5692 its how quite they are.  Some tubes tend to have little bit of noise let say some are more microphonic than others, these 5692 are among the quietest i"ve heard.  

post #3883 of 4206
Thread Starter 

George the 5692 are very quiet with very little micro phonics.

 

I don't like the RCA variant, I find the Hytron brown base much better.

The Swedish Standard 33S30 is the king but at $700 no way unless one has some already.

The SS were used in vessel's gun control systems, very robust.

 

There is also GE 5692 black base ones. 

post #3884 of 4206
Quote:
Originally Posted by Neogeo333 View Post
 

I like the TS 6f8g much much better than these.  Specially the one with round mica.  One thing I noticed about the 5692 its how quite they are.  Some tubes tend to have little bit of noise let say some are more microphonic than others, these 5692 are among the quietest i"ve heard.  

The 6F8G are a little microphonic but overall musical.  I also like the Sylvania VT99 which are similar in sound to the tS. I do not roll much anymore  but soone or later will get a pair of 6sn7WGT Brown base and a pair of 5692 just to have some.

post #3885 of 4206
Quote:
Originally Posted by Frank I View Post
 

they have a stellar reputation.

 

... of sounding like crap. :devil_face:

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