There was also an xtal control mod for the BC-191 and BC-375.   The mod was popular in the 60's when CAP got hundreds of them issued to units.  

K3HVG

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From: [email protected] <[email protected]> on behalf of B. Smith via MRCA <[email protected]>
Sent: Monday, April 20, 2026 8:56:24 PM
To: Military Radio Collectors Association <[email protected]>
Subject: [MRCA] ART-13 Mod Info Needed

 Attached photo of a "Crystal Control" mod for the ART-13. I believe it was published in an early MARS or perhaps even a Club bulletin.
I would like a copy of the mod to be included in a ART-13 Compilation.
Z