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Barker & Williamson (B&W) 40 JCL, 40 Meter Plug in Band Coil Used in Very Good Condition #1

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MPN:
JCL
Condition:
Used
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$24.99
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Barker & Williamson (B&W) 40 JCL, 40 Meter Plug in Band Coil Used in Very Good Condition #1

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The Barker & Williamson (B&W) JCL plug-in band coils are part of the vintage "Junior Coil" series from the 1940s–1950s, designed for amateur radio (ham) applications. These are compact, air-wound inductors on ceramic bases with plug-in pins (typically 4–6 pins, often 5-pin configurations), intended for quick band-switching in transmitters, exciters, oscillators, or low-power driver stages.Key Details
  • JCL Designation: "JCL" stands for Junior Coil, Center-Linked (center-tap or center-link coupled). This variant includes a center-linked pickup coil for balanced/push-pull circuits, impedance matching, or coupling in stages like oscillator-buffer-doublers or push-pull finals. It contrasts with "JEL" (end-linked for single-ended circuits) or other suffixes like JVL/BVL (often variable-link or different bases).
  • Series Overview: The Junior series was for lower-power applications (e.g., up to 50–100 watts input in typical tube setups, conservative ratings for reliability). They feature high-Q air-wound construction (tinned copper wire on ceramic/steatite forms), a main tuning coil plus a smaller link coil, and banana-style or pin plugs for socket mounting. Common in homebrew rigs, modified commercial transmitters, or period ham setups inspired by ARRL Handbook designs (1940s–1950s editions).
  • Usage: Popular for crystal-controlled CW/AM transmitters, MOPA (Master Oscillator Power Amplifier) stages, or as plug-in elements for multi-band operation. They pair well with variable capacitors and were often used in oscillator, buffer, or final amplifier circuits.
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