Heathkit SB Line Dial Drive Assembly

[Rick Parent]

Got an answer Ralph....

I'm going to try to show it with a Visio drawing when I get a chance. It's a
simple fix, but hard to explain. I still haven't applied the fix to any of my
radios yet because I just moved into a new home and don't have a decent
workspace set up. And, there are other problems with mine that I discovered
while trying to do this.......

Remove the dial knob. Loosen the dial shaft lock nut. At this point, if you
lift the top cover and use a flashlight to look directly down on the backside
of the front panel, you'll see the end of the dial drive pulley (it's actually
the other end of the part you just loosened the lock nut of). It's supposed to
"straddle" the inner edge of the dial drive ring. Yours is all the way in past
this ring. That's why you have to pull out to get enough friction to move the
dial. If you carefully lift up as you are pulling out, and get the dial drive
pulley to "straddle" the inner edge of the dial drive ring, you're golden. It
should look like a sandwich when you're done: the dial drive ring in between
the TWO halves of the dial drive pulley. Then, push the shaft DOWN until you
feel the proper amount of resistance to cause friction on the dial drive ring,
and re-tighten the shaft lock nut. Replace the knob and try it out. That should
do it!

Thanks to all the people who answered my plea! It's nice to know I stumbled
into a group of really responsive individuals who care as much about these old
"Greenies" as I do.   73's!

Rick

Ralph Hogan wrote:

> Rick,
> I have to pull outward on my SB-102 vfo knob to let it have traction to
> turn the dial... if you get it figured out...  let us all know...  My old
> HW-101 I had and the later SB303 dont seem to be aflicted. I'm sure someone
> on here will
> have the answer we need.
> Ralph WB4TUR
>
> ----------
> From:   Rick Parent[SMTP:rparent at sky.net]
> Sent:   Monday, March 22, 1999 9:13 PM
> To:     HEATH at LISTSERV.TEMPE.GOV; BOATANCHORS at LISTSERV.TEMPE.GOV;
> BASWAPLIST at foothill.net; heathkit at qth.net; boatanchors at theporch.com
> Subject:        Heathkit SB Line Dial Drive Assembly
>
> Hi Gang...
>
>             Been away for awhile.....OOOoohhhh 25 years or so. Built my
> share of "greenies" when I was younger and never remember having a lot
> of trouble with dial drives on SB's. Had a 101 and a 102. I remember the
> dial drives being pretty smooth, considering their makeup. Recently,
> I've decided to get reacquainted with this addiction of ours and have
> bought a 300, 400, and a 101 in the last couple of weeks. ALL THREE have
> the dreaded "Dial Drive Disease"!! Looks to me like the dial drive
> pulley (#100-444) is just spinning (with the knob - of course) and not
> making contact with the Dial Drive Ring (or Circular Dial Plate Assembly
> #100-M449). I'm guessing this because I haven't actually pulled any of
> the front panels. Just been squinting behind the panels, with a
> flashlight, looking down the front side of the chassis trying to figure
> out why the hell the numbers aren't moving 'round anymore! Am I all wet
> here? Is there something I'm missing? Or am I just incredibly lucky to
> have gotten three examples of shoddy assembly practices? Would think
> that this has got to be a really common problem, since I'm batting 3 for
> 3! Anybody have a source for these parts? I'd really like to get my
> hands on the "whole bag" of goodies (#100-M450 - Dial Drive Assembly).
> I'm thinking that there's a real opportunity here to made some money
> going into production!
>
> Also looking for the AM Filter (#404-201 - 3.75khz), FL3, for an SB-300.
>
> Thanks & 73's!
>
> Rick Parent,  KA1GBJ
> rparent at sky.net

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