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Air Variable Capacitor Model 4990, 28 to 176 pF, 2100 Volt Single Section

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Condition:
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  • Military surplus 4990 single-section air variable capacitor, 28–176 pF, approximately 2100 V peak rating. Compact multi-plate design with ~1/32-inch plate spacing and 1/4-inch shaft. Measures about 3 × 3 × 2-1/4 inches. Ideal for amateur radio transmitters, antenna tuners, or RF projects needing a rugged medium-voltage tuning capacitor.
  • Military surplus 4990 single-section air variable capacitor, 28–176 pF, approximately 2100 V peak rating. Compact multi-plate design with ~1/32-inch plate spacing and 1/4-inch shaft. Measures about 3 × 3 × 2-1/4 inches. Ideal for amateur radio transmitters, antenna tuners, or RF projects needing a rugged medium-voltage tuning capacitor.
  • Military surplus 4990 single-section air variable capacitor, 28–176 pF, approximately 2100 V peak rating. Compact multi-plate design with ~1/32-inch plate spacing and 1/4-inch shaft. Measures about 3 × 3 × 2-1/4 inches. Ideal for amateur radio transmitters, antenna tuners, or RF projects needing a rugged medium-voltage tuning capacitor.
  • Military surplus 4990 single-section air variable capacitor, 28–176 pF, approximately 2100 V peak rating. Compact multi-plate design with ~1/32-inch plate spacing and 1/4-inch shaft. Measures about 3 × 3 × 2-1/4 inches. Ideal for amateur radio transmitters, antenna tuners, or RF projects needing a rugged medium-voltage tuning capacitor.
$14.99
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Description

Air Variable Capacitor Model 4990, 28 to 176 pF, 2100 Volt Single Section

Key Specifications:
  • Brand: Military Surplus (G.I. Corporation / similar)
  • Model: 4990
  • Sections: 1 (single-section)
  • Capacitance: 28 pF minimum to 176 pF maximum
  • Plate spacing: Approximately 1/32 in (0.031 in)
  • Voltage rating: Approximately 2100 V peak (consistent with published ratings for this model and ARRL Handbook guidelines for ~0.030 in air-gap spacing)
  • Shaft: 1/4 in diameter
  • Dimensions (approx.): Length 3 in, Width 3 in, Height 2-1/4 in
  • Construction: Compact multi-plate air-dielectric design with metal frame and locking feature typical of military surplus units. Rugged construction suited for RF applications.
This matches known G.I. / military 4990 series specifications (commonly listed as 25–170 pF @ 2100 V).
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