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EF Johnson 36 pF - 500 pF Single Section Air Variable Capacitor

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  • EF Johnson 500 pF Single Section Air Variable Capacitor – 36-500 pF. Genuine E.F. Johnson Co. compact single air variable ideal for ham radio transmitters, amplifiers, and antenna tuners. Rugged aluminum construction with steatite insulation, approx. 8″ L × 4″ W × 4″ H, ¼″ shaft. Clean used condition. Perfect for vintage restoration or high-power RF projects. Nationwide Radio & Eq. Sales – ke9pq.com.
  • EF Johnson 500 pF Single Section Air Variable Capacitor – 36-500 pF. Genuine E.F. Johnson Co. compact single air variable ideal for ham radio transmitters, amplifiers, and antenna tuners. Rugged aluminum construction with steatite insulation, approx. 8″ L × 4″ W × 4″ H, ¼″ shaft. Clean used condition. Perfect for vintage restoration or high-power RF projects. Nationwide Radio & Eq. Sales – ke9pq.com.
  • EF Johnson 500 pF Single Section Air Variable Capacitor – 36-500 pF. Genuine E.F. Johnson Co. compact single air variable ideal for ham radio transmitters, amplifiers, and antenna tuners. Rugged aluminum construction with steatite insulation, approx. 8″ L × 4″ W × 4″ H, ¼″ shaft. Clean used condition. Perfect for vintage restoration or high-power RF projects. Nationwide Radio & Eq. Sales – ke9pq.com.
  • EF Johnson 500 pF Single Section Air Variable Capacitor – 36-500 pF. Genuine E.F. Johnson Co. compact single air variable ideal for ham radio transmitters, amplifiers, and antenna tuners. Rugged aluminum construction with steatite insulation, approx. 8″ L × 4″ W × 4″ H, ¼″ shaft. Clean used condition. Perfect for vintage restoration or high-power RF projects. Nationwide Radio & Eq. Sales – ke9pq.com.
$36.99
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Description

EF Johnson 36 pF - 500 pF Single Section Air Variable Capacitor

Specifications & Information
Genuine E.F. Johnson Co. (Waseca, MN) single-section air-variable capacitor. Nameplate shows CAP μμF 500 with blank Type/Cat. No. and Serial fields. Your measurements closely match the common Type “D” / 500D35-style single-section units (and related Type C high-capacity singles).
 
 
 measured / stated specs:
  • Sections: 1
  • Capacitance: 36–500 pF
  • Dimensions: Length 8″, Width 4″, Height 4″
  • Plate spacing / air gap: ~1/6″ (≈0.167″; typical catalog value for this size/family is 0.080″)
  • Shaft: ¼″ diameter
Catalog correlation & construction:

Heavy aluminum end frames, aluminum plates, steatite (ceramic) insulators, and ¼″ shaft. These were designed for medium-power RF use in amateur transmitters, linear amplifiers, antenna tuners, and loading networks. The compact 8″ length is a popular size for chassis or panel mounting. Voltage rating:
For the common 0.080″ gap versions of this exact size and capacitance, peak voltage is 3,500 V. Units with wider spacing (closer to your stated 1/6″) can reach higher (up to ~7 kV in related Type C models). Always confirm with a high-pot test if the application is critical.
 
 
Clean used. Free-turning shaft, good plate meshing, and intact steatite supports visible in the photos.
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