Tubes Asylum

forget the 12SN7; U want 12SX7!

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In Reply to: 12sn7gt tubes posted by sacd_ lover on September 25, 2004 at 03:56:56:

Fergit the 12SN7; Get the RCA JAN-CRC 12SX7; it is identical to a 12SN7 electrically, but had tighter production controls, higher batch sampling, etc. "THE" 12SX7 has mid 1940s datecodes, bottom getters (rectangular)and is reputedly made by GE.(Just like GE made the Red Base RCA 5692)They are the best thing going in an octal medium-mu (6SN7 etc)except for the roundplate TungSols and damn near any 7N7 loctal. Nice treble like the Sylvanias but they have some meat in the mids. Great stuff. The tube center (I think) has them for $30. Just do a "12SX7" search. If you have a variable DC filament supply, don't forget about the 8SN7 too.

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Re: forget the 12SN7; U want 12SX7! - Damir 00:15:21 09/26/04 (0)
"The 12SX7 is simply 12SN7 selected for transconductance at Ua=28V...(Distortion) test shows no significant difference compared to the standard 6SN7/12SN7." - M. Jones, "Valve Amplifiers 3"
And (my comment) even little worse than average results... IMO - get (still cheap) "blackened glass" `40 RCA 12SN7.
Re: forget the 12SN7; U want 12SX7! - Jimmy 18:58:26 09/25/04 (0)
You are missing one- Sylvania early 1940s 6SN7GT black flat stagger plate. Somewhat unknown, one audiophile stated runs neck & neck with Tung-Sol 6SN7 round black plate.
I have watched these tubes in larger numbers disappear on AudioGon within hours at $95/pr.
Re: forget the 12SN7; U want 12SX7! - sacd_lover 18:24:50 09/25/04 (1)
Thanks g, I have been checking the 12sx7's out too. The search here has many positive comments about that tube and I know where I can get some of those. I just wanted to try the inexpensive 12sn7's first to see how they compared to my 6sn7's. I do have another question, how good are the JAN GE 12sn7's. If GE made the RCA's that are so highly thought of, has anyone tried the GE 12sn7's? I have managed to find and purchase a few of those. I havent heard them yet though as my amp isnt due for another week. I appreciate the knowledgeable responses I receive from the members on this board so I welcome any comments.
- I have used and use the 12SN7 and 12SX7 and prefer the . . - John PA 21:05:10 09/25/04 (0)
  12SN7 grey glass. I find that the 12SX7, when I used it in my preamp, and when tried in my dac, to be slightly dull. I have a number of these and prefer some different types of 12SN7's to that tube. I also have many 6SN7's including 2 nos 1942 Tungsol round plate black glass, that are fantasitic but for me the 12SN7's are a much better deal and just as good.
  ja in dark and windy, Tucson, AZ
  
  The Elaborate DAC=55/76 or 27 Balanced Preamp=Balanced Six Pacs=Newform Research 645

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