[Boatanchors] 6211 = 12AX7 ? 12AU7?

Sun, 12 Jan 2003 18:32:02 +0200

Gary

Well, at first, I was going to say my memory must not be
any good, but if the 6414 is a double triode, then maybe that
was the tube I recall.  Interesting, tho, a dual triode is
what the AX/AT/AU family is.

I noted in your list of alternatives for the AT/AU/AV
family, you did not list the 6414, so one could assume that
the 6414 does not have the same pin out as the AT/AU/AX 
family, or if it does, then something in the ratings 
makes in unusual.

thanks for the information.

73
Sheldon
WA4MZZ/SV7

Gary wrote:
> 
> 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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> 
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