[ARC5] R23 repair, dynamotor mounts, questions...

[AKLDGUY .]

Well, I just learned that the capacitor is isolated from ground
in the AN/ARC-5 as factory assembled. I assumed it was
meant to be grounded because I forgot that my one and only
receiver is the ARA CBY-46105.

Thanks for pointing that out guys. Learned something new.

73 de Neil ZL1ANM


On 12/23/15, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> On 23 Dec 2015 at 3:45, aa9il at sbcglobal.net wrote:
>
>> Hello
>> Im working on an R23 receiver that was modified but never finished.
>> "Someone"
>> removed the dynamotor mounts
>
> HOW were they removed? They simply un-screw, but many hams in past
> "ages" didn't know that, and often destroyed the threaded places in the
> chassis when they removed them.
>
>> and the small metal stud that is near the 3 pin
>> plug - the plug is still there.
>
> As I remember it, there should be THREE studs near the plug.
>
>> does anyone have 4 of the dynamotor mounts?
>
> Hmmm....I MAY have, but will have to search my pile, and I can't do that
> until
> spring at this point.
>
>> Once I clean the tube, coil pins, sockets, tweak the trimmers, deoxit,
>> etc, I
>> will go over the wiring mods - it looks like this was a 12v change so I
>> will
>> check the wiring adds.
>
> If the filament wriing mods were done correctly, you may elect to leave them
>
> alone.
>
>> There were two bathtub caps removed I'll put in new mylar caps.
>>
>> One thing I saw was the 15uF capacitor is mounted on a small insulation
>> mount -
>> so its not bolted to the chassis.
>
> Yes. That was a feature in some of the early models which (as I remember it)
>
> fed an ILS system. You can safely remove that insulator and the ground wire
>
> and bolt the cap directly to the chassis
>
>> There is a ground wire soldered to the flower pot with a solder type lug.
>> Also
>> interesting is that the 15uF cap is rated at 35v
>
> Correct. All of those AF (12A6) cathode-bypass caps were 35 volt
>
>> So, a work in progress - has anyone else encountered the 'isolated' 15uF
>> cap?
>
> Yes. Often. See above. That is a "factory" feature. As I said, just remove
> both the ground wire and the insulator and bolt the cap directly to the
> chassis....if it is still good.
>
> Ken W7EKB
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