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EF Johnson 250 E 45, 21-78 pF Dual Section Air Variable Capacitor 3500V

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MPN:
250 E 45
Condition:
Used
Shipping:
$12.00 (Fixed Shipping Cost)
  • EF Johnson 250 E 45, 21-78 pF Dual Section Air Variable Capacitor 3500V
  • Genuine E.F. Johnson 250E45 dual-section air variable capacitor. Each section approximately 21-78 pF, 0.125″ plate spacing, ~3500 V peak rating. Robust Type E design with steatite insulation, aluminum plates, and ¼″ shaft. Ideal for ham radio, antenna tuners, amplifiers, transmitters, and RF projects. Dimensions approx. 11⅝″ L × 2⅝″ W × 2⅝″ H. Classic Waseca, MN quality. Clean used condition. Perfect for restoration or new builds needing reliable dual air-variable capacitance.
  • Genuine E.F. Johnson 250E45 dual-section air variable capacitor. Each section approximately 21-78 pF, 0.125″ plate spacing, ~3500 V peak rating. Robust Type E design with steatite insulation, aluminum plates, and ¼″ shaft. Ideal for ham radio, antenna tuners, amplifiers, transmitters, and RF projects. Dimensions approx. 11⅝″ L × 2⅝″ W × 2⅝″ H. Classic Waseca, MN quality. Clean used condition. Perfect for restoration or new builds needing reliable dual air-variable capacitance.
  • Genuine E.F. Johnson 250E45 dual-section air variable capacitor. Each section approximately 21-78 pF, 0.125″ plate spacing, ~3500 V peak rating. Robust Type E design with steatite insulation, aluminum plates, and ¼″ shaft. Ideal for ham radio, antenna tuners, amplifiers, transmitters, and RF projects. Dimensions approx. 11⅝″ L × 2⅝″ W × 2⅝″ H. Classic Waseca, MN quality. Clean used condition. Perfect for restoration or new builds needing reliable dual air-variable capacitance.
  • Genuine E.F. Johnson 250E45 dual-section air variable capacitor. Each section approximately 21-78 pF, 0.125″ plate spacing, ~3500 V peak rating. Robust Type E design with steatite insulation, aluminum plates, and ¼″ shaft. Ideal for ham radio, antenna tuners, amplifiers, transmitters, and RF projects. Dimensions approx. 11⅝″ L × 2⅝″ W × 2⅝″ H. Classic Waseca, MN quality. Clean used condition. Perfect for restoration or new builds needing reliable dual air-variable capacitance.
  • Genuine E.F. Johnson 250E45 dual-section air variable capacitor. Each section approximately 21-78 pF, 0.125″ plate spacing, ~3500 V peak rating. Robust Type E design with steatite insulation, aluminum plates, and ¼″ shaft. Ideal for ham radio, antenna tuners, amplifiers, transmitters, and RF projects. Dimensions approx. 11⅝″ L × 2⅝″ W × 2⅝″ H. Classic Waseca, MN quality. Clean used condition. Perfect for restoration or new builds needing reliable dual air-variable capacitance.
$24.99
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Description

EF Johnson 250 E 45, 21-78 pF Dual Section Air Variable Capacitor 3500V

Specifications
  • Manufacturer: E.F. Johnson Co., Waseca, Minn., U.S.A.
  • Model / Type: 250E45 (Type E series dual-section configuration)
  • Sections: Dual
  • Capacitance per section: Min. ~21 pF, Max. ~78 pF (your measured values; catalog single-section 250E45 is ~32–241 pF at 0.125″ spacing — dual versions share similar plate design with reduced per-section capacitance)
  • Plate spacing: 0.125″
  • Peak voltage rating: Approximately 3500 V (consistent with Type E 0.125″ spacing models)
  • Shaft: ¼″ diameter
  • Dimensions (your measurements): Length 11⅝″, Width 2⅝″, Height 2⅝″ (matches Type E panel space of ~2¾″ × 2⅝″ for dual construction)
  • Construction: Aluminum plates with rounded edges, heavy aluminum end frames and tie rods, steatite insulators, standard Johnson rotor contacts. Designed for medium-power RF service with good rigidity and low losses.
This is a longer dual-section Type E unit suitable for antenna tuners, amplifiers, and transmitters.
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