[Heath] SB tuning mechanism

[Bob G3OOU]

Hi Dave

The first thing I would check is the bush on the front panel through 
which the tuning shaft passes.

Then you can release the friction drive and see if the 0-500KHz dial is 
free or stiff to turn. I have often found that the friction drives are 
set much too tight which not only make them more difficult to turn but 
puts far too much stress on the plastic centre which can then start to 
crack - another wekk known problem.

73

Bob

Bob F Burns G3OOU, G-QRP 6907, @BobFBurns
Crystal Palace Radio & Electronics Club: http://cprec.btck.co.uk/
Admin/sales site: http://www.g3oou.co.uk/ Technical site: www.qsl.net/g3oou

On 07/12/2021 20:47, Dave Edwards wrote:
> I'd appreciate input on this:
>
> When SB tuning friction gets a bit more difficult, what is the most 
> likely culprit?
>
> This is an SB301, and the rig is sold, built well, and the tuning 
> hardware is in great shape, But from
>
> age, it is now a bit tight. I'm thinking something needs a micro drop 
> of oil, but I really don't want to have
>
> to open the LMO.   And, if the rig is on a long time, and heats 
> up.....yes, it gets easier to tune.
>
>  I think this is a very typical issue.
>
> Anyone?
>
> .....Dave
>
> _______________________________________________
> Heath mailing list
> Heath at puck.nether.net
> https://puck.nether.net/mailman/listinfo/heath