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Signal Corps FT-243 Case CS-137 and Crystals for the SCR-509/510 and SCR-609/610 radio sets

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MPN:
CS-137
Condition:
Used
Shipping:
$18.00 (Fixed Shipping Cost)
  • Signal Corps FT-243 Case CS-137 and Crystals for the SCR-509/510 and SCR-609/610 radio sets
  • Signal Corps FT-243 Case CS-137 and Crystals for the SCR-509/510 and SCR-609/610 radio sets
  • Signal Corps FT-243 Case CS-137 and Crystals for the SCR-509/510 and SCR-609/610 radio sets
  • Signal Corps FT-243 Case CS-137 and Crystals for the SCR-509/510 and SCR-609/610 radio sets
  • Signal Corps FT-243 Case CS-137 and Crystals for the SCR-509/510 and SCR-609/610 radio sets
$149.99
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Description

Signal Corps FT-243 Case CS-137 and Crystals for the SCR-509/510 and SCR-609/610 radio sets

 This box has two sections. One is full and the other os partially full.

The Case CS-137 (full designation: Signal Corps Case CS-137) is a WWII-era U.S. Army Signal Corps accessory designed to store and transport up to 120 quartz crystals in FT-243 holders. These are the standard plug-in crystal type used in many military shortwave/vehicle radios of the period.This specific case was primarily associated with the SCR-509/510 and SCR-609/610 radio sets. These were FM vehicular radio systems used in jeeps and other vehicles during World War II and into the Korean War era:
  • SCR-510 and SCR-610: Transmitter-receiver combinations for tank and armored vehicle use (FM, typically in the 27-38.9 MHz or similar ranges depending on the variant).
  • SCR-509 and SCR-609: Related vehicular FM sets, often for reconnaissance or command purposes.
The CS-137 case was commonly mounted or stored inside the associated power supply units (such as PE-120 or PE-117-C dynamotor supplies) for these sets. It provided a portable assortment of pre-numbered FT-243 crystals to allow quick selection and swapping of operating frequencies (channelized operation, common in military FM nets to avoid interference and ensure interoperability).Many surviving examples of these cases (often seen on sites like eBay or military surplus sales) contain numbered crystals in the ranges that align with those sets' bands, and collectors frequently describe them as "Jeep radio" crystal kits for the SCR-510/610 family.If your crystals are numbered (e.g., in sequences like channels or direct frequencies in kHz/MHz), that would confirm the preset channels for those specific nets. These radios used crystal control for stability in mobile FM voice communications.For more details on the exact frequencies or crystal channel assignments, you'd typically refer to the technical manuals (e.g., TM 11-615 for SCR-609/610 variants),
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