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Bud OCP-10A, 10 Meter 75 Watt Oscillator and Buffer Coils in Excellent Condition in Box #1

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OCP-10A
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Bud OCP-10A, 10 Meter 75 Watt Oscillator and Buffer Coils in Excellent Condition in Box #1

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The Bud OCP Series refers to a vintage line of plug-in oscillator and buffer coils produced by Bud Radio Inc. (Cleveland, Ohio) in the 1940s–1950s era for amateur radio (ham) transmitters. These were higher-power variants in Bud's O-series plug-in inductors, rated for 75 watts input (typically in oscillator, buffer, or doubler stages; conservative for CW or low-duty modes to avoid overheating).The "OCP" designation likely stands for Oscillator Coil Pentode (or similar), designed specifically for circuits using pentode tubes (e.g., 807, 6146, or equivalents) where the main winding is not center-tapped (unlike OCL types), and they feature a fixed link (coupling coil) at one end for impedance matching to antenna/grid circuits. They were built for efficient RF performance in low-to-medium power multi-band transmitters, with high Q, air-wound tinned copper on glazed ceramic bases with banana plugs (fitting standard 5-prong tube sockets).Known Models in the OCP SeriesFrom vintage catalogs (e.g., Bud Radio Parts Catalog No. 140 from 1939 and later references in Walter Ashe 1955, AMfone archives, and eBay/surplus listings), the series covers standard HF amateur bands:
  • OCP-80 — For 80-meter band (3.5–4.0 MHz).
  • OCP-40 — For 40-meter band (7.0–7.3 MHz).
  • OCP-20 — For 20-meter band (14 MHz).
  • OCP-10 — For 10-meter band (28–29.7 MHz).
  • Other variants: Likely OCP-160 (160m, rarer) and possibly OCP-15 or higher bands, though mid-HF like 40/20m are most common in surviving examples.
Related Bud O-series for comparison (often sold alongside):
  • OEL — End-linked (fixed end link), no center tap, often 50–75W rated (e.g., OEL-20-A 20m 75W fixed link).
  • OCL — Center-linked (fixed center link, main winding center-tapped), typically 50W.
  • OLS — Adjustable/swinging center link, 50W.
  • OEP — Similar to OCP but possibly end-linked pentode variants.
The OCP line was distinguished for pentode oscillator/buffer use, with rigid construction and attractive appearance per old Bud ads.General Information
  • Construction: Air-core, tinned copper wire wound on glazed ceramic form/base with banana plugs. Fixed link for coupling; no adjustable mechanism (unlike OLS). Center-untapped main winding suited for pentode configs.
  • Purpose: Band-switching in oscillator (crystal/VFO) or buffer-doubler stages of transmitters. High efficiency, low losses; plug-in for quick band changes in homebrew or kit rigs.
  • Power Handling: 75 watts (input rating for oscillator/buffer; higher than 50W OLS/OEL in some docs, but derate for phone/AM to prevent issues).
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