[Collins] 75S3B parts

[Dr. Gerald N. Johnson]

On 1/8/2012 9:42 AM, L D Ritta wrote:
>
> Hello All
> I have started work again on my 75S-3B receiver, however I lacking some
> screws, the one for securing the rack onto the chassis.
> I have no idea what size and type they are, they appear to be nonferrous
> maybe aluminum. I also lack the L10 bfo coil and a 75S-3B black
> Escutcheon  and the main tuning knob and the af/rf gain knob and Preselector
> knob and power  and mode knob.

All hardware is stainless steel. Always phillips head. As an aside, its 
beneficial to tighten all the screws at ground lugs and tube sockets to 
break down accumulated oxides.
>
> Can someone explain how the Vfo and the dial and knob fit together, I had a
> look at the Collins manuals but there are no pictures showing
> These details, I just get the feeling I am missing some component/s, if
> someone can point in the right direction.

Service Information letters 1007 and 1011. Available at:
http://collinsra.com/sb/index.html#SIL

The latest manual available on line shows more details of that assembly 
and has mechanical parts in the parts list.

There is the index with adjustment gear and knob.

There are two dials, one connected to the PTO shaft and the mask that 
turns at a different speed with gear teeth on their edges, different 
numbers of gear teeth and an idler gear to make them turn at different 
rates.

>
> If you have any of the mentioned parts please holler.

Surplus Sales of Nebraska may have some of the knobs and parts though 
they often think they are gold plated or solid gold. 
http://www.surplussales.com There are some available through the Collins 
Radio Association at http:/collinsra.com
>
> 73's Lee.
>
>
73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association