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

[J. Forster]

An interesting link:

http://www.radiomuseum.org/forum/mallory_inductuner_and_inputuner.html

-John

=================



> 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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