[Milsurplus] Mallory Inductuners... was CV-253 & APR-1/4

[John Vendely]

You are correct, the old CEI/W-J tuneable VHF/UHF receivers used Mallory 
inductuners.  Other manufacturers of similar, contemporary receivers 
used them as well.  Probably a couple of hundred thousand of them were 
manufactured for use in the AN/VRC-12 family radios (RT-246, RT-524, 
R-442, and ARC-131).  They were very reliable in these non-scanning 
applications.  I'm unaware of any serious problems with them in scanning 
applications...

73,
John K9WT

On 11/30/2013 4:12 PM, J. Forster wrote:
> With thanks to Robert, I just got a schematic of the CV-253. Turns out, it
> uses Mallory (style?) Inductuners...  flat, helical coils on a bakelite
> substrate with a wiper that progressively shorts more and more of the
> winding as the shaft is rotated.
>
> I've only seen these puppies in the GLR-9 and the civilian version the ACL
> SR-209. They may also be used in some of the W-J and/or CEI ELINT
> receivers of the early-mid 1950s.
>
> Does anyone know of any earlier use than the CV-253? I cannot remember
> anywhere else they were used in tube circuits, either.
>
> Also, since they have a wiping metal-metal contact, they seem a poor
> choice for a scanning receiver because of wear. Any experiences?
>
> Curious,
>
> -John
>
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