[Thenewguy007]

 
I think you should try a 6F8G Flat Plate Tung Sol too.

 
I have been reading through the thread so far.
 
-Tung Sol 6SN7 BGRP are mentioned as among the best of the 6Sn7 tube, but are like $200 for a single one.
 
-Then there was talk about the 7193 being better than any 6SN7 tube.
 
-Lastly the talk seemed to be about the 6F8G as being superior to 6SN7?
 
 
Anyone own a Ken-Rad 7193 & Tung-Sol 6F8G & made direct comparison between them?

 

[jibzilla]

 
For really good air and openness there are several tubes that come to mind.  A Sylvania W and bottom getter GTs should give you good top end, the other tube that comes to mind is the Hytron  pre CBS if possibl;e. Good Luck with this one, looking good

 
My 2 fav. 6sn7's. Very neutral yet still very extended. W's over pre cbs (fuller sound) but they are very hard to find not microphonic and almost always more expensive than the pre cbs.

 

[r one]

  I do not think that the circuit is faulty.
As Mechans say, it is a possibility with such old products. I have 3 other identical fivre 6SN7 which are perfectly silent. This is unfortunate but not serious and after a second listen of many hours, if this hissss sound persist i will try to have an arrangement with the seller to refund it.

 Damn, i'm not in chance. Yesterday, i decided to have a listen session with my TS Round plate (bought NIB and used 50 hours only)...it's not silent too and make this wind sound, i'm 100% sure that this tube was totally silent few months ago !!! I'm wonder if my eddie current amp would have any other problem like 6x4 tubes from power supply (3000 hours used approximatively) near dead .
It's very strange, my other tubes are silent, and i'm really sure that my Vt231 rp's was it too.
What do you think about ?

 

[isquirrel]

 
 Damn, i'm not in chance. Yesterday, i decided to have a listen session with my TS Round plate (bought NIB and used 50 hours only)...it's not silent too and make this wind sound, i'm 100% sure that this tube was totally silent few months ago !!! I'm wonder if my eddie current amp would have any other problem like 6x4 tubes from power supply (3000 hours used approximatively) near dead .
It's very strange, my other tubes are silent, and i'm really sure that my Vt231 rp's was it too.
What do you think about ?

When you take the tube out are there any noises coming from the inside? Are the pins clean and secure, does it match the other one in level ? 
 
Could just be burn in, they take a while and are best left on for early long stretches and plenty of heat cycles to help with burn in and to get rid of any oxidation that may have built up over the years.

 

[jamato8]

 
 Damn, i'm not in chance. Yesterday, i decided to have a listen session with my TS Round plate (bought NIB and used 50 hours only)...it's not silent too and make this wind sound, i'm 100% sure that this tube was totally silent few months ago !!! I'm wonder if my eddie current amp would have any other problem like 6x4 tubes from power supply (3000 hours used approximatively) near dead .
It's very strange, my other tubes are silent, and i'm really sure that my Vt231 rp's was it too.
What do you think about ?

Did you switch the 6SN7 positions? Does the sound follow the tube? They can get noisy sometimes. And sometimes it can get quiet again with some time on. 

 

[r one]

No I didn't because I can't. My amp use only one 6sn7 for preamp . The power tubes are two PX4 triodes.

 

[dminches]

No I didn't because I can't. My amp use only one 6sn7 for preamp . The power tubes are two PX4 triodes.

 
The issue you are having is similar to what i had with my Cary SLP-05. It was caused by the tube sockets not making good contact with the pins.

 

[r one]

Great news guys.
I've changed today my rectifiers for NOS 6X4W Tung Sol and problem is resolved. Absolutely no wind sound, no ffffffffff in the backround : all is quiet again. I'm Happy.

 

[silentmoon]

 
 
Not my photo but the one from the eBay auction -- the 6N8S MELZ just arrived and I plugged it into my Studio Six, replacing the GE 5692. Very nice synergy with the Brimar 6V6GTs. I've been wanting just a touch more air to the sound and this just about nails it.

 
In Vietnam i have around 100 pcs of nos 6h8c mel-z  

 

[jamato8]

 
 
In Vietnam i have around 100 pcs of nos 6h8c mel-z  

Lucky you. :^)

 

[tubesareus]

Any significant sonic difference between  RCA 6SN7GT grey glass and  RCA JAN CRC 6SN7GT VT 231 grey glass ?
The later one is one of my favourites and there seems to be $30 to $60 gap between the  two.

 

[gibosi]

  Any significant sonic difference between  RCA 6SN7GT grey glass and  RCA JAN CRC 6SN7GT VT 231 grey glass ?
The later one is one of my favourites and there seems to be $30 to $60 gap between the  two.

 
They are identical. That is, if they were manufactured at the same time, they are identical. The labels are meaningless with respect to these tubes. Only the date of manufacture matters.

 

[tubesareus]

Thank you gibosi.
I have done some reading about 6sn7 tubes in general but not to many sonic opinions between same manufacturers .
I remember VT231 designation was stopped some time after war 1950?  so what would be a worthy replacement for that military RCA ?  how much do they change in sound in later productions ?

 

[gibosi]

I am not a connoisseur of the RCA 6SN7GT, so I can't say... Perhaps someone else will chime in? The best I can do is point you to the 6SN7 reference thread, on the chance you haven't seen it:
 
http://www.head-fi.org/t/117677/the-reference-6sn7-thread
 
In general, sonically speaking, 6SN7 manufactured beginning in the early 1940's and into the early 1950's are the best. But of course, this is only my opinion.

 

[JazzVinyl]

I am not a connoisseur of the RCA 6SN7GT, so I can't say... Perhaps someone else will chime in? The best I can do is point you to the 6SN7 reference thread, on the chance you haven't seen it:

http://www.head-fi.org/t/117677/the-reference-6sn7-thread

In general, sonically speaking, 6SN7 manufactured beginning in the early 1940's and into the early 1950's are the best. But of course, this is only my opinion.

I had a pair of 1940's grey glass RCA 6SN7's that I didn't like very much. They seemed to be bass shy in my system.

Also have a pair of 1950's Ken Rad VT231's and they are my favourite 6SN7's thus far. Exciting, with generous bass, and 'space and air' between instruments, that I love.

Cheers...