I just have the MC-415 issued for the BC-946 and the ARC 5611 for the R-24/ARC-5, Mike.  Photo below.  There is no part number marking on the MC-415, but there is mention of it in the description of the BC-946-B in an addendum to T.O. 08-10-50 dated 15 Feb 1943 for the SCR-274-N set.  Like all the earlier remote control receiver tuning dials, it is simply engraved with white paint filler.  The 5611 has wider electroluminescent paint numerals that glow brightly under a UV light. 

A UV light doesn't do much for the SCR-274-N set. 

- Mike  KC4TOS



On 6/17/2022 3:05 PM, Mike Morrow wrote:
Yes, there were several different styles of the .52 to 1.5 MHz remote tuning dials between the ARA, SCR-274-N, and AN/ARC-5 sets.  The one that was always supplied and stored on the R-24/ARC-5 tube cover is officially the ID-26/ARC-5, but it will only be marked with a four-digit A.R.C. part number.  I think Mike Hanz has these shown on aafradio.org.
 
The main reason for existence of the R-24 was for use with the AN/ARR-1 "ZB" homing adapted and the AN/ARN-9 "Air Trak" ILS, but the AN/ARR-1 was replaced by the AN/ARR-2 and the AN/ARN-9 was replaced by the AN/ARN-5 glide slope with RC-103-A localizer ILS receivers by 1944.
 
The R-24 was a white elephant, but it was ALWAYS supplied with its remote tuning dial.
 
I don't know of a source.  I got mine on ebay.
 
Mike / KK5F
 
-----Original Message-----
From: MARK DORNEY 
Sent: Jun 17, 2022 6:09 AM
To: 
Subject: [MRCA] Remote tuning dial for R24/ARC-5
 
Anybody know if there was a remote tuning dial made for the “coffee grinder” remote tuner for the R-24/ARC-5 receiver? Also, would anybody have an idea where I might buy one if there were made?
 
Mark D.
WW2RDO