[R-390] WTB Main Tuning Knob for R389

[Thomas Hoyer]

The main tuning knob for the 389, while it looks similar is not the same as that used on the 901 and 390A. It has a built in clutch to prevent damaging the PTO when tuning at the end points plus the main tuning shaft is larger in diameter so the std 390 series knob will not fit.
I may end up using a donor 390 knob and modifying it using some creative machining and brass rod to allow for the larger tuning shaft.
But first I figured I'd at least test the waters to see if there was one out there
TomW3TA


-----Original Message-----
From: DogT <agfa at hughes.net>
To: r-390 <r-390 at mailman.qth.net>
Sent: Thu, Dec 5, 2019 11:05 am
Subject: Re: [R-390] WTB Main Tuning Knob for R389

They can be repaired if the 'fingers' are broken. I got a bronze bushing 
and glued it in the drilled out hole and it works fine. Of course you 
may just need a whole new one.

On 12/5/2019 8:39 AM, Thomas Hoyer via R-390 wrote:
> I know this is looking for a needle in a haystack attempt but - does anyone have a main tuning knob for an R389 that they'd be willing to part with?
> Tom
> W3TA
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