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6SN7 Tube Addicts - Page 280

post #4186 of 4253
Thread Starter 
Quote:
Originally Posted by MMMan View Post

Also, about 100 posts back on this thread you thought about making a adapter that up regulates heater voltage (6.3 to 12v) to allow use of 12sn7 s in 6sn7 amps. Did you ever do this? It would likely sell like hot cakes!!!!

 

Glenn makes these adapters, but his amps can be built with a 6/12/25V switch so you can use any of them.

 

The CBS 6SN7GTB is a very nice tube as Rob mentioned above.

post #4187 of 4253
Quote:
Originally Posted by rosgr63 View Post
 

The CBS 6SN7GTB is a very nice tube as Rob mentioned above.

 

In the 6SN7 Reference thread:

 

"CBS/Hytron 6SN7GTB
[black bases, red labels, side getter]
These tubes are rebranded GE 6SN7GTB tubes"

 

Are they rebranded GE's?

post #4188 of 4253
Quote:
Originally Posted by MMMan View Post

Also, about 100 posts back on this thread you thought about making a adapter that up regulates heater voltage (6.3 to 12v) to allow use of 12sn7 s in 6sn7 amps. Did you ever do this? It would likely sell like hot cakes!!!!


I have already made this adapter but the amp has to be running the 6SN7 off AC.

If you can take a reading 6.3 volts AC or close.  It will not work on a amp running the 6SN7 on DC.

post #4189 of 4253
Quote:
Originally Posted by Skylab View Post


Not sure what the mystery is here. This is a CBS 6SN7GTB. Nice little tube.

 

Thanks. There were no date or manufacturer codes, and I didn't have anything to compare this to. Nice to know it is a real CBS, by CBS!!

post #4190 of 4253
Quote:
Originally Posted by Xcalibur255 View Post

Ha!  I knew I wasn't crazy.  The second I saw it I thought "that looks like the photo of Rob's tube closet."  

What a cool idea.

Yes, that is the first thought that entered my mind too!!!

PS - yes, I'm doing my homework... Reading the entire thread from the start...
post #4191 of 4253

Is the CV1988 a direct replacement for the 6SN7 tube? They sure are expensive!

post #4192 of 4253
Quote:
Originally Posted by Rossliew View Post
 

Is the CV1988 a direct replacement for the 6SN7 tube? They sure are expensive!


To the best of my knowledge & experience, Yes. I bought mine for $ 140 about 3 months back. How much did you see them for ?

post #4193 of 4253
Quote:
Originally Posted by punit View Post
 


To the best of my knowledge & experience, Yes. I bought mine for $ 140 about 3 months back. How much did you see them for ?

I just did a random search on eBay and the listings were for $200+ for pairs...must have been inflation peaking recently..

post #4194 of 4253

If the base of a tube is slightly loose, what is the best/safe way to fix it ?

plaster/superglue/ what can withstand the heat ?

 

( when i insert the tube, sometimes it didnt light up, if i give it a slight touch on the base, it will work)

post #4195 of 4253
Quote:
Originally Posted by Lorspeaker View Post
 

If the base of a tube is slightly loose, what is the best/safe way to fix it ?

plaster/superglue/ what can withstand the heat ?

Try clear nail polish, I tried it once it worked (altough I couldn't be bothered to go buy a bottle of clear NP so I used a red one which my wife had). I think someone on head fi had recommended it  few months back but can't remember who.

 

edit: got it

 

http://www.head-fi.org/t/410326/for-6as7g-tube-rollers-here/1170


Edited by punit - 8/21/14 at 9:32am
post #4196 of 4253

Thanks Punit,

tried it a while ago, think it is working...

not exactly clear polish...with some silver dust :P

post #4197 of 4253
Quote:
Originally Posted by gibosi View Post
 

Are they rebranded GE's?

 

That is a fair question. The side getter and the (sometimes) stencilled-looking type number are very GE-like. On the other hand, the plate structure is very Sylvania-like, and GE used ladder plates in their GTBs. (Only ladder plates?)

post #4198 of 4253
Quote:
Originally Posted by Lorspeaker View Post
 

Thanks Punit,

tried it a while ago, think it is working...

not exactly clear polish...with some silver dust :P


hmm...you audiophiles have to put silver in everything ....:D

post #4199 of 4253

Intriguing, I would have guessed Sylvania because of the angled plates. I just assumed CBS got gobbled up by a bigger company by the time the 6SN7GTB "rolled" around.

post #4200 of 4253

I find the early CBS/Hytron 6SN7GT to be quite a nice tube, but as the 6SN7 Reference thread suggests that the later CBS 6SN7GTB are GE rebrands I have simply ignored them. As it now appears that these red label GTB's may not be rebrands, I think I should give them a try.

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