[ARC5] [Bulk] Re: R23 repair, dynamotor mounts, questions...

[Jack Antonio]

>
> On 12/23/15, aa9il at sbcglobal.net <aa9il at sbcglobal.net> wrote:

>> One thing I saw was the 15uF capacitor is mounted on a small insulation
>> mount - so itsnot bolted to the chassis.
>> There is a ground wire soldered to the flower pot with a solder type lug.
>> Also interesting is thatthe 15uF cap is rated at 35v
>> So, a work in progress - has anyone else encountered the 'isolated' 15uF
>> cap?

The capacitor you are referring to is probably C-30. In an unmodified
R-23 or R-24 it is a coupling cap that passes audio from the cathode
of the output tube, to pin 4 of the front panel plug. This was to
support an ILS system that saw little use.

In these two receivers, the 12A6 is being used as a cathode follower,
in addition to its normal role of driving the headphone lines.

This was only done in the AN/ARC-5 receivers, not the SCR-274N
or ARA.

If one side of C-30 is grounded, it is probably one of the mods
done by a previous owner.

Jack Antonio WA7DIA/4