[Boatanchors] 6211 = 12AX7 ? 12AU7?

Sun, 12 Jan 2003 11:02:26 -0500

Sheldon:
    The 6414 is a 9-pin, medium mu, double triode. Also know as CK6414. Cost
around 10 bucks.
    The 6814 is a 8-pin, medium mu, triode ( pencil ) tube.
Cost around 4 bucks.
Regards
Gary...WZ1M


----- Original Message -----
From: "Sheldon Daitch" <[email protected]>
To: "Reed Park" <[email protected]>
Cc: "Bill Beech" <[email protected]>; <[email protected]>
Sent: Sunday, January 12, 2003 10:04 AM
Subject: Re: [Boatanchors] 6211 = 12AX7 ? 12AU7?


> Reed,
>
> thanks, but IIRC, there are more other four digit numbered
> tubes that are in the same family.  GE indicated a 6679 for
> the 12AT7  in the Progress Line manuals, as well as the 6681
> you mentioned below for the 12AX7.
>
> I believe that GE had line of 5 Star 4-digit tubes that
> were "superior" to the number-letter-number tubes, and
> even some of the four digit versions.  Some of the
> variations were for controlled filament currents and
> warm-ups, for series operations, 6 volt vs 12 volt mobile
> operations, in that day.
>
> But back to the original discussion on 6211/AT/AU/AX family
> lookalikes, I remember, way back, getting some old military surplus
> printed circuit cards that had two tubes on the end of the
> card, both tubes looked like an AT/AU/AX tube, but it had a
> number that I also could never figure out from the commercial
> catalogs at the time, and somewhere way back in memory cellar,
> I recall that these tubes were specifically designed as flip-flops
> for old tube computer use, and had lower voltage and current
> ratings than the real AT/AX/AU family tubes. Out on limb, and
> too many years of San Miguel has passed, but why does 6814
> or 6414 come up in the memory.  I haven't looked at any tube sites,
> so if these really aren't legit for the point of the discussions,
> just consider it a guess.
>
> 73
>
> Sheldon
> WA4MZZ
>
>
> Reed Park wrote:
> >
> > Sheldon Daitch wrote:
> >
> > > I am really going to show my ignorance here, but weren't there at
least
> > > one four digit tube identifier for a tube that looked like a
> > > 12AU7/12AX7, same dual triode, same mechanical look, designed
> > > specifically for either vacuum tube flip-flop or multivibrator use,
way
> > > back where there were vacuum tube "computers?"
> > >
> > > Is this 6211 possibly one of these units?
> > >
> > > Sheldon
> > >
> > > Bill Beech wrote:
> > > >
> > > > Bob,
> > > >
> > > > According to my tube data, that is neither a 12AU7 nor a 12AX7.  It
has
> > > > lower plate voltage ratings than either of those.  I hold no
> > > > replacements for it.
> > > >
> > > > 73,
> > > > Bill, NJ7P
> > > >
> >
> > 12AU7W  -  6189
> > 12AU7     -  6680
> > 12AT7     -  6201
> > 12AX7     -  6681
> >
> > 7 3
> > Reed
> >
> > --
> >
> > ARROW Research  (Avro CF-105)
> > Reed Park
> > 252 Gauvin Road
> > Dieppe, New Brunswick
> > Canada    E1A1M1
> >
> > Amateur Radio  V E 1 N U
> > WW II, # 19 SET user
> > Paraset replica builder
> >
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