[Test-Equipment] Test-Equipment Digest, Vol 158, Issue 1 Variable Inductors: how were they used and in what ???

[jfurman]

Doug, "channel" the idea of a vhf tv tuner.
Three tubes are probably rf amplifier, mixer, and local oscillator.
Mallory called these things "inductuners" in the day.
There were versions that used spiral ribbon wound coils with a rider 
operated by the shaft, you
seem to have the ordinary helical version.
There was a scheme that skipped the frequency gap between the low and 
high tv bands also, but
  some were just continuous tuning including the fm band.
I'm sure your grid dip meter will confirm the frequency range for tv.

73, Jeff AD6MX

-----------------------------
>
> Message: 5
> Date: Fri, 24 Aug 2018 14:49:53 +0000
> From: Doug Hensley <w5jv at hotmail.com>
> To: MilSurplus QSLNet <milsurplus at mailman.qth.net>,
> 	"test-equipment at mailman.qth.net" <test-equipment at mailman.qth.net>,
> 	boatanchors mailman.qth.net <boatanchors at mailman.qth.net>
> Subject: [Test-Equipment] Variable Inductors: how were they used and
> 	in what	???
> Message-ID:
> 
> 	<DM5PR15MB1483ABB101F4915EFDDFE76591360 at DM5PR15MB1483.namprd15.prod.outlook.com>
>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Resending this:
>
> I have a variable inductor that is about the size of a Collins PTO
> overall.  Has three tubes,  three sections of 1 inch roller 
> inductors,
> totally shielded.  On the front it has gearing like the 51J3 (R388)
> receiver and has both course and fine tune.
>
> Measures about 3 in wide, 4 in tall, 8-10 inches long.  Manfactured
> by Mallory.
>
>
> What i would like to know is whether anyone is familiar with the use
> of variable inductors during the war and if so, what was the
> application remembered?  Was any particular manufacturer or brand of
> equipment known to use them?  Was it used for varying frequency or
> mostly in test equipment ?   I can send pictures to anyone willing to
> jog their memories.
>
>
> Thanks,
>
>
> Doug W5JV
>