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Barker & Williamson Air-Dux PI #195-2 high-power Pi-network tank coil for HF Amateur Radio Amplifiers & Transmitters With HD Band Switch Used

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MPN:
PI 195-2
Condition:
Used
Shipping:
$18.00 (Fixed Shipping Cost)
  • Used Air Dux PI 195-2 (Barker & Williamson) 1 kW HF Pi-network tank coil. Classic high-power inductor for 80-10 meter amateur radio amplifiers and transmitters. Excellent condition vintage piece ideal for homebrew 813, 4-400A, or 3-500Z linear amplifiers
  • Used Air Dux PI 195-2 (Barker & Williamson) 1 kW HF Pi-network tank coil. Classic high-power inductor for 80-10 meter amateur radio amplifiers and transmitters. Excellent condition vintage piece ideal for homebrew 813, 4-400A, or 3-500Z linear amplifiers
  • Used Air Dux PI 195-2 (Barker & Williamson) 1 kW HF Pi-network tank coil. Classic high-power inductor for 80-10 meter amateur radio amplifiers and transmitters. Excellent condition vintage piece ideal for homebrew 813, 4-400A, or 3-500Z linear amplifiers
$49.99
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Description

Barker & Williamson Air-Dux PI #195-2 high-power Pi-network tank coil for HF Amateur Radio Amplifiers & Transmitters With HD Band Switch Used.

 This Silver Plated tank coil and band switch is in excellent condition.

Up for sale: One used Air Dux PI 195-2 high-power Pi-network tank coil by Barker & Williamson (also known as PI-195-2). Rated for 1000 watts input, this classic air-wound coil is perfect for building or repairing kilowatt HF amplifiers on 80 through 10 meters.Heavy-duty construction with easy-tap sections — a favorite among homebrewers for use with tubes like 813, 4-400A, 3-500Z and more. Great for AM, SSB, or CW linear amplifiers.This is a genuine vintage piece in good used condition.
Air Dux PI 195-2 (also called PI-195-2 or Barker & Williamson Air-Dux PI #195-2) is a high-power Pi-network tank coil designed for HF amateur radio amplifiers and transmitters.
 
 
Key Specifications & Data
  • Type: Multi-section air-wound Pi-network inductor (large Air Dux style with indented turns for easy tapping).
  • Power Rating: Rated for 1,000 watts (1 kW) input, suitable for high-power HF operation (SSB, CW, AM).
     
     
  • Bands: Covers 80 through 10 meters when used in a proper Pi-network with suitable tuning and loading capacitors.
  • Construction: Heavy-duty air-core coil with multiple winding sections (strap/wide conductor for high-current sections + wire windings). Silver-plated or tinned versions exist; silver-plated preferred for lower losses at high power. Includes provisions for taps.
     
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  • Design: High Q, low loss, robust for kilowatt-level plate tank circuits.
Common Applications / Gear Used WithThese coils were popular in homebrew and commercial HF tube amplifiers from the 1960s–1980s:
  • Grounded-grid linear amplifiers using tubes like 813, 4-400A, 3-500Z, 4-1000A, etc.
  • Popular in designs from GE Ham News, QST magazine articles, and homebrew kilowatt amplifiers.
  • Used in transmitters and amplifiers running up to 1 kW input on 80–10 meters.
     
     
  • Common in classic AM/CW/SSB rigs and high-power exciters.
They are a go-to choice for builders needing a reliable, high-power Pi tank coil without winding their own.
 
 
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