There were 12AU7, 12AT7 and 12AX7 at a minimum. All were dual triodes. I 
couldn't say what made them different one from the other.

[One of my earliest electronics projects was building a flip-flop using a 
12A?7 tube.]

Bob Ammerman
RAm Systems.


----- Original Message ----- 
From: "Olin Lathrop" <olin_piclist@embedinc.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Monday, March 07, 2005 1:00 PM
Subject: Re: [EE] Wire wrapping insight needed!


> John Ferrell wrote:
>> "12AUX7"? I think you mean 12AX7...
>
> I don't have my RCA manual in this office, so I'll have to check later.  I
> do remember there were two version, one was a special lower noise version 
> of
> the other.  The low noise version was a popular front end for microphone
> amplifiers.
>
>
> *****************************************************************
> Embed Inc, embedded system specialists in Littleton Massachusetts
> (978) 742-9014, http://www.embedinc.com
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist