[bladesmith]

Hello friends,

I have been going thru my tube sets recently. Checking them for there different sound qualities and clarity.
And I'm not sure where I got these tubes,  or from whom I purchased them from..
but , they are simply beautiful in every way..they work great in my little buffer, which requires a 6SN7 tube.

 Anyone have a pair like them..?

🍿🍿🍿

[musicdre]

JAN = joint army navy.  so they were spec-ed for military use, and could have been made by a number of manufacturers.  surely someone will ID them.

[Tyson]

That's a 12SX7 which is a variation of a 12SN7.  And a 12SN7 is a 12 volt version of a 6SN7.  I have a bunch of them from back when I had a Mapletree tube preamp about 10 years ago.  It's a nice tube, sounds just like a 6SN7 but is generally cheaper because it requires a 12v circuit instead of a 6v circuit. 

[FullRangeMan]

I have some regular 6SN7 US made red base I bought from a AC member, these 12V versions have a stronger emission useful to drive big output tubes as GM70.
The date code seems 1961, 22th week.
The CLRV seems to be plant code.

[Freo-1]

I initially used 12SN7/12SX7's in my 110 watt 1625 mono amps.  However, based on advice received from my good audio buddy, switched out the 12SN7's to 6BL7's.  In this application, the 6BL7 works much better as a driver/phase splitter over the 12SN7.  It's a stouter tube, and costs less.  Since it was used in TV sets, they had to be well made.






http://tdsl.duncanamps.com/show.php?des=6BL7