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Leach Relay Co. 1702-MX Vintage Military Grade Electromagnetic Relay Used in the BC-610 Transmitter New in Box

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MPN:
1702-MX
Condition:
New
Shipping:
$7.00 (Fixed Shipping Cost)
  • NEW in Original Box — Vintage Leach Relay Co. 1702MX with 115 VAC coil (normally closed, DPDT). Authentic military-grade relay, fresh NOS stock. Used in BC-610 transmitters and SCR-399/499 radio sets for antenna switching, T/R functions, and mode control. Perfect for restoring classic WWII/Korean War-era amateur (ham) radio Boat Anchor gear. Pristine condition with original factory box and clear markings. Tested for coil and contact operation. Ideal collector/restoration part. Ships fast and securely packaged!
  • NEW in Original Box — Vintage Leach Relay Co. 1702MX with 115 VAC coil (normally closed, DPDT). Authentic military-grade relay, fresh NOS stock. Used in BC-610 transmitters and SCR-399/499 radio sets for antenna switching, T/R functions, and mode control. Perfect for restoring classic WWII/Korean War-era amateur (ham) radio Boat Anchor gear. Pristine condition with original factory box and clear markings. Tested for coil and contact operation. Ideal collector/restoration part. Ships fast and securely packaged!
  • NEW in Original Box — Vintage Leach Relay Co. 1702MX with 115 VAC coil (normally closed, DPDT). Authentic military-grade relay, fresh NOS stock. Used in BC-610 transmitters and SCR-399/499 radio sets for antenna switching, T/R functions, and mode control. Perfect for restoring classic WWII/Korean War-era amateur (ham) radio Boat Anchor gear. Pristine condition with original factory box and clear markings. Tested for coil and contact operation. Ideal collector/restoration part. Ships fast and securely packaged!
  • NEW in Original Box — Vintage Leach Relay Co. 1702MX with 115 VAC coil (normally closed, DPDT). Authentic military-grade relay, fresh NOS stock. Used in BC-610 transmitters and SCR-399/499 radio sets for antenna switching, T/R functions, and mode control. Perfect for restoring classic WWII/Korean War-era amateur (ham) radio Boat Anchor gear. Pristine condition with original factory box and clear markings. Tested for coil and contact operation. Ideal collector/restoration part. Ships fast and securely packaged!
  • NEW in Original Box — Vintage Leach Relay Co. 1702MX with 115 VAC coil (normally closed, DPDT). Authentic military-grade relay, fresh NOS stock. Used in BC-610 transmitters and SCR-399/499 radio sets for antenna switching, T/R functions, and mode control. Perfect for restoring classic WWII/Korean War-era amateur (ham) radio Boat Anchor gear. Pristine condition with original factory box and clear markings. Tested for coil and contact operation. Ideal collector/restoration part. Ships fast and securely packaged!
$34.99
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Description

Leach Relay Co. 1702-MX Vintage Military Grade Electromagnetic Relay Used in the BC-610 Transmitter New in Box

Leach Relay Co. 1702MX (also referenced as Type 1702 MX) is a vintage military-grade electromagnetic relay from the WWII / early post-WWII era. It features a 115 VAC (117 VAC nominal) coil and normally closed (NC) contacts. These relays were built to high reliability standards for military communications equipment, with rugged construction suitable for shock, vibration, and harsh environments.
 
scribd.com
Key Specifications
  • Coil Voltage: 115–117 VAC, 60 Hz
  • Contact Configuration: DPDT (Double Pole Double Throw) — confirmed in military manuals
  • Contact Rating: Approximately ½ amp per contact at high voltage (per BC-610 technical references); suitable for control and low-to-medium power RF switching applications
  • Type: Hermetically sealed or environmentally protected rugged design (typical for Leach milspec relays of the period)
  • Mounting: Socket or direct panel/solder terminal
  • Purpose: Antenna switching, T/R (transmit/receive) switching, overload protection, short-out relays, and mode switching (e.g., phone/CW)
Usage in Vintage Amateur Radio GearYes — it was specifically used in vintage military and amateur radio equipment. Primary documented application:
  • BC-610 series transmitters (and related SCR-399/SCR-499 sets) as RY4 (RF relay / antenna short-out) and in similar switching roles (e.g., phone/CW switching).
     
    radiomanual.info
These were common in post-WWII surplus "Boat Anchor" ham radio setups. Restorers and collectors of BC-610 and similar tube-era gear actively seek original Leach 1702MX relays for authentic restorations.
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