[Hallicrafters] 5894 Tube for the HA-6 Transverter

[jeremy-ca]

The 7854 came out before the 8643 and was the original big 5894.

I remember a Motorola Tech telling me that the house branded 8643 had 
something done so that it couldnt swap with a non Moto branded tube. A pin 
swap maybe? Urban myth? They certainly had enough clout to do it.

Carl
KM1H



----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: <dhallam at rapidsys.com>; "Hallicrafters Reflector" 
<hallicrafters at mailman.qth.net>
Sent: Sunday, August 26, 2007 8:34 PM
Subject: Re: [Hallicrafters] 5894 Tube for the HA-6 Transverter


> Your "other" tube is probably an 8643.  It is the next
> step "up" from the 5894.  Motorola used them in the
> highband U73LHT and U73MHT 110 watt output Motrac FM
> units.  Also used them in the very last U71LHT 100
> watt output lowband Motrac units.
>
> Those sold by Motorola parts had a very long "in
> house" number and didn't "say" 8643 anywhere on them.
>
> Glen, K9STH
>
>
> --- "David C. Hallam" <dhallam at rapidsys.com> wrote:
>
> One is marked 5894A and the other has no
> identification.  I have tried all the usual tricks to
> raise numbers with no success. The unmarked tube
> appears identical to the 5894A with two exceptions.
>
> The anode surface has three radiating fins instead of
> two. The anode connector pins on top are about 60%
> larger in diameter.
>
> In other respects the tubes are the same; the glass
> envelope is the same and the base pins are the same.
>
> Is this tube just an improved version of the 5894A or
> what?
>
>
>
>
>
>
>
>
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> 
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