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Cardwell 18 to 360 pF 1500 Volt Single Section Air Variable Capacitor

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  • Vintage Cardwell single-section air variable capacitor, 18–360 pF, approximately 2500 V peak rating. Classic USA-made multi-plate design with variable-thickness plates, ~1/16-inch spacing, and 3/16-inch diameter × 1.4-inch shaft. Measures about 4 × 4 × 3-1/2 inches. Built under U.S. Patents 1,626,391 and 1,672,367. Ideal for amateur radio transmitters, receivers, antenna tuners, or restoration projects needing reliable RF tuning components.
  • Vintage Cardwell single-section air variable capacitor, 18–360 pF, approximately 2500 V peak rating. Classic USA-made multi-plate design with variable-thickness plates, ~1/16-inch spacing, and 3/16-inch diameter × 1.4-inch shaft. Measures about 4 × 4 × 3-1/2 inches. Built under U.S. Patents 1,626,391 and 1,672,367. Ideal for amateur radio transmitters, receivers, antenna tuners, or restoration projects needing reliable RF tuning components.
  • Vintage Cardwell single-section air variable capacitor, 18–360 pF, approximately 2500 V peak rating. Classic USA-made multi-plate design with variable-thickness plates, ~1/16-inch spacing, and 3/16-inch diameter × 1.4-inch shaft. Measures about 4 × 4 × 3-1/2 inches. Built under U.S. Patents 1,626,391 and 1,672,367. Ideal for amateur radio transmitters, receivers, antenna tuners, or restoration projects needing reliable RF tuning components.
  • Vintage Cardwell single-section air variable capacitor, 18–360 pF, approximately 2500 V peak rating. Classic USA-made multi-plate design with variable-thickness plates, ~1/16-inch spacing, and 3/16-inch diameter × 1.4-inch shaft. Measures about 4 × 4 × 3-1/2 inches. Built under U.S. Patents 1,626,391 and 1,672,367. Ideal for amateur radio transmitters, receivers, antenna tuners, or restoration projects needing reliable RF tuning components.
  • Vintage Cardwell single-section air variable capacitor, 18–360 pF, approximately 2500 V peak rating. Classic USA-made multi-plate design with variable-thickness plates, ~1/16-inch spacing, and 3/16-inch diameter × 1.4-inch shaft. Measures about 4 × 4 × 3-1/2 inches. Built under U.S. Patents 1,626,391 and 1,672,367. Ideal for amateur radio transmitters, receivers, antenna tuners, or restoration projects needing reliable RF tuning components.
  • Vintage Cardwell single-section air variable capacitor, 18–360 pF, approximately 2500 V peak rating. Classic USA-made multi-plate design with variable-thickness plates, ~1/16-inch spacing, and 3/16-inch diameter × 1.4-inch shaft. Measures about 4 × 4 × 3-1/2 inches. Built under U.S. Patents 1,626,391 and 1,672,367. Ideal for amateur radio transmitters, receivers, antenna tuners, or restoration projects needing reliable RF tuning components.
$24.99
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Description

Cardwell 18 to 360 pF 1500 Volt Single Section Air Variable Capacitor

 Excellent Load capacitor, with a lot of capacitance in a small package

Key Specifications:
  • Brand: Cardwell
  • Model: Unmarked (stamped with U.S. Patent 1,626,391 and 1,672,367)
  • Sections: 1 (single-section)
  • Capacitance: 18 pF minimum to 360 pF maximum
  • Plate spacing: Approximately 1/16 in (0.0625 in)
  • Estimated voltage rating: ~1500 V peak (standard ARRL Handbook guideline for ~0.05–0.07 in air-gap spacing; practical RF rating)
  • Shaft:1/4 inch diameter × approximately 1.4 in long
  • Special feature: Variable-thickness plates (up to ~3/32 in at thickest point)
  • Dimensions (approx.): Length 4 in, Width 4 in, Height 3-1/2 in
  • Construction: Classic Cardwell multi-plate air-dielectric design with metal frame, ceramic or insulated supports, and mounting provisions. Built under the early Cardwell patents for low-loss, rigid rotor support and high min-to-max capacitance ratio.
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