[Milsurplus] Recaping RCH

[Barry Hauser]

Hi Ed & gang:

I have several Scott receivers of various models and all have that 
lineup of four 4mfd bayonet mount can caps.  They are not the usual 
bayonet style as the base is bakelite or phenolic -- insulated -- with 
two leads coming out through the bottom.  From the parts lists and 
schematics, I think these are actually oil-filled paper caps rather than 
electrolytics. In  one case, the cap snapped off at the base as they are 
right alongside the chassis and vulnerable when the receiver is carried 
or moved outside of its case.

If what I surmised is true, you can replace with large value orange 
drops or yellow poly caps.  I've seen values listed as high as 2 mfd.  
An alternative is to use a can electrolytic of higher value.  I've been 
told you can go substantially higher - 8 or 10 mfd. 
2 mfd caps could be wired in parallel, but you have to fit 8 of them 
under the chassis in that corner.  I think it's do-able.


However, NOS capacitors of the same type may not be good due to aging on 
the shelf.  Also, in the design, they chose to use insulated caps -- the 
cans are not grounded.  With the more typical bayonet mounts, there is 
only one positive terminal and the can is the ground connection.  As I 
recall, I don't see any polarity  indications on the  schematics, nor 
color code for the leads.

Anybody else familiar with these?

regards,
Barry





Edward J White wrote:
> Hi Gang:
> I am looking for some (Qty 4),  4 mfd @ 600 VDC Electrolytic 
> capacitors. I have been looking in Mouser Electronics and did not see 
> anything. Reforming these caps is not an option as they are leaking. I 
> have reformed others of this high value and they are still alive and 
> doing well. The other caps are all .01, .05, .1 mfd  @ 600 VDC and 
> orange drop cabs will do the job just fine.
> Any help on the electrolytic caps will be great like part number and 
> where to order them.
> Ed
> WA3BZT
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>