[ARC5] those little bitty ball bearings

[Mike Morrow]

Dennis wrote:

>It would certainly help to know if the R-23 variable is a direct
>replacement as that would give me a viable repair option along
>with ball replacement.  But given that the frequencies are different
>by a factor of three, it would mean that the coils would have to be
>different by a factor of 9 to use the same cap.  It seems that would
>be a stretch for the design.

It's not much of a problem, especially at the low frequencies of the command sets.

You should be able to find a red painted ARC part number on your R-24/ARC-5 tuning capacitor frame.

The following receivers use the same capacitor:

Part Number:  ARC-3936         346 uuF
ARA CBY-46129                 .19 - .55
R-23, -23A, -148/ARC-5     
BC-453
ARA CBY-46145                 .52 - 1.5
R-24/ARC-5
BC-946

Part Number:  ARC-4601        147 uuF
ARA CBY-46104                1.5 - 3.0
R-25/ARC-5
ARA CBY-46105                3.0 - 6.0
R-26/ARC-5
BC-454

Part Number:  ARC-6558         62 uuF
ARA CBY-46106                6.0 - 9.1
R-27/ARC-5
BC-455

I'd assume the equivalent receivers in the post-WWII A.R.C. Type 12 set (R-10A, R-11A) and in the pre-WWII RAV (CBY-46102 and CBY-46103) and ARC Type K receivers would be close also, so maybe you could find one of those old dogs to rob for parts.   :-)

73,
Mike / KK5F