I believe the gain spec changed on each tube, there are AT, AY, AU, and
AX7's.



--- Bob Ammerman <rammerman@verizon.net> wrote:
> 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
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