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Harris / Multronics Heavy Duty Mil-Spec 1.5–50 uH Variable Roller Inductor with Silver-Plated Ribbon Coil & 2 Double Contact sets #3

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MPN:
755017A4530
Condition:
Used
Shipping:
$28.00 (Fixed Shipping Cost)
  • Harris roller inductor, variable inductor 50uH, military roller inductor, silver plated variable coil, HF antenna tuner parts, linear amplifier inductor, green Delrin variometer, 50 uH rotary coil, radio transmitter surplus, heavy duty variable inductance
  • Harris roller inductor, variable inductor 50uH, military roller inductor, silver plated variable coil, HF antenna tuner parts, linear amplifier inductor, green Delrin variometer, 50 uH rotary coil, radio transmitter surplus, heavy duty variable inductance
  • Harris roller inductor, variable inductor 50uH, military roller inductor, silver plated variable coil, HF antenna tuner parts, linear amplifier inductor, green Delrin variometer, 50 uH rotary coil, radio transmitter surplus, heavy duty variable inductance
  • Harris roller inductor, variable inductor 50uH, military roller inductor, silver plated variable coil, HF antenna tuner parts, linear amplifier inductor, green Delrin variometer, 50 uH rotary coil, radio transmitter surplus, heavy duty variable inductance
  • Harris roller inductor, variable inductor 50uH, military roller inductor, silver plated variable coil, HF antenna tuner parts, linear amplifier inductor, green Delrin variometer, 50 uH rotary coil, radio transmitter surplus, heavy duty variable inductance
$189.99
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Description

Harris / Multronics Heavy Duty Mil-Spec 1.5–50 uH Variable Roller Inductor with Silver-Plated Ribbon Coil & 2 Double Contact sets #3

Harris Green-Frame Roller Inductor – 1.5 to 50 µHGenuine military-style Harris (or equivalent) large roller inductor with distinctive green plastic (Delrin-type) frame. Measured continuous range 1.5–50 µH. Features air-wound silver-plated flat ribbon coil and (2) dual silver contacts that ride on the inside of the turns. ¼″ shaft for standard drive or coupling. Overall size approximately 13″ long × 5″ wide × 6″ high. Excellent high-Q construction suitable for HF antenna tuners, matching networks, or amplifier tank circuits. Smooth roller action when cleaned and lubricated. A substantial, high-performance roller for higher-power amateur radio or surplus projects.
 
 
This is a larger Harris (or Harris-family / military surplus) roller inductor with the same distinctive green plastic (Delrin-type) frame construction. It matches the documented Harris military units (example: 755017A4530 and related) that feature green or black frames, heavy silver-plated flat-ribbon coils, and dual wipers/contacts that ride on the inside of the ribbon turns.
 
 
Specs & Information
  • Inductance range: 1.5–50 µH (measured; continuous variable via the internal roller contacts)
  • Coil: Air-wound, flat ribbon, silver-plated
  • Contacts: (DUAL) Double silver-plated wipers contacting the ribbon from inside the coil
  • Shaft: ¼″ diameter
  • Frame/body: Green-colored plastic (Delrin or similar high-strength insulating material) end plates, center support, and structure
  • Dimensions: Approx. 13″ long × 5″ wide × 6″ high (matches your measurements)
  • Typical current rating (comparable ribbon units): 8–15+ A range depending on exact ribbon cross-section (these are medium-to-high power capable)
  • Construction notes: Open-frame design optimized for HF antenna tuners, matching networks, and amplifiers. High-Q air-core style. Military-origin units were built for reliability under RF voltage and current stress. The dual internal contacts provide low-resistance, high-current contact.
These appear in surplus from Harris (FSCM 14304 and related NSNs) and sometimes under Gates or other rebranded labels from the same production era.
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