[Collins] 75A-4 dead on 40 mtrs only

[rls19]

Dave,

The first thing I would do is clean the band switch. 15 meters went dead on my A-4 and that was what fixed it.

73,
Bob AD3K

> On Apr 23, 2018, at 8:20 AM, David Propper <k2dp at charter.net> wrote:
> 
> HI all,
> 
> Just finished re-capping my SN1135 75A-4 and it was working beautifully for 2 days. Last night, 40 mtrs just went absolutely dead. Receive sensitivity is fine on all other bands. I pulled all the crystals just to be sure it wasn’t an intermittent contact. Looking at the schematic, I suspect that possibly C10- a 300mmf mica padding capacitor across the first stage coil might have gone south.  This cap (postage stamp red mica) does have a blister on it at one end.
> 
> Any other thoughts / recommendations as to the culprit ? I probably won’t have a chance to work on the receiver until later this week.
> 
> Any help would be appreciated.
> 
> Thanks and 73,
> Dave, K2DP
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