Heathkit SB Line Dial Drive Assembly

[Multi-Volti Devices]

I'm sure you all have seen the copper/bronze washers that split. I tried
filling them with solder (back sides) and then sanding them smooth if any
solder weeps thru, but it's a hit or miss fix.

Murray
-----Original Message-----
From: Edward Swynar VE3 CUI <gswynar at DURHAM.NET>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Tuesday, March 23, 1999 4:41 PM
Subject: Re: Heathkit SB Line Dial Drive Assembly


>Rick...
>
>Don't flip yer lid just yet!
>
>That front panel / eschutcheon mounting hole behind the main tuning knob on
>the SB-series is not round for good reason: before you spend another dime,
>or otherwise do something rash, remove the main tuning knob, lightly loosen
>the nut holding the drive assembly to the escutcheon (that's LOOSEN! DON'T
>remove the  nut!), and apply gentle downward pressure on the drive...
>
>Now, re-tighten the nut, re-install the knob. If it STILL slips, repeat the
>process. If it continues to slip with the drive unit as far down as it'll
>go, you'll have to remove the drive from the rig (lotsa work!) and
>"re-build"  it by removing the two copper flange wheels (held on with a
>screw at the end) and installing curved washers on the outside of both to
>increase friction.
>
>Either way, you're compensating for the "relaxation" of the flanged drivers
>over time. The situation is serious, but certainly NOT hopeless!
>
>Good luck & 73, de Eddy VE3CUI - VE3XZ
>
>
>----------
>> From: Rick Parent <rparent at sky.net>
>> 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
>> Date: March 22, 1999 10:13 PM
>>
>> 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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