Re: {Collins} 51J-4 & 4:1 Knob



Mike, my 51J4 main tuning shaft was tapped with 6X32 threads. I merely screwed in a 6X32 cap screw which gave me the necessary length to couple the 4:1 reduction assembly.

Bob, KN4HH

--- On Tue, 2/2/10, Michael C. Marx <sndtubes@xxxxxxxxxxxxxxx> wrote:

> From: Michael C. Marx <sndtubes@xxxxxxxxxxxxxxx>
> Subject: {Collins} 51J-4 & 4:1 Knob
> To: collins@xxxxxxxxxxxxx
> Date: Tuesday, February 2, 2010, 7:49 PM
> Hi Everyone,
> 
> A while ago, I bought a 4:1 dial that I want to install on
> my 51J-4.  I'm finally getting around to installing it
> but ran into a little snag that maybe someone who has done
> this before could shed a little light on.  It seems
> that the shaft is just ever so slightly too short.  I
> removed the collar that was on the shaft, so that isn't the
> problem.  When I slide the drive all the way to where
> it's flush with the front panel, the shaft just barely
> starts to enter the front bearing.  It needs to go
> about maybe 1/16 to 1/8 inch further to be fully inserted
> into the bearing.  Has anyone ever installed one of
> these on their 51J4 and is there any additional shaft length
> I can get from taking the shaft loose inside the radio and
> sliding it out a little?  Or am I going to have to make
> a whole new shaft?
> 
> thanks,73,
> Mike WB0SND
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