EF Johnson
EF Johnson 50-150 Dual Section Air Variable capacitor, 50 pF Each
- MPN:
- 50-150
- Condition:
- Used
- Shipping:
- $18.00 (Fixed Shipping Cost)
Frequently bought together:
Description
EF Johnson 50-150 Dual Section Air Variable capacitor, 50 pF Each (actually measures 66 pF each)
EF Johnson Dual Air Variable Capacitor – Type 50-150
Genuine E.F. Johnson Co. dual-section air variable capacitor, Type/Cat. No. 50-150. Labeled 50–150 pF per section at 7500 volts with 0.125″ air gap. ¼-inch shaft. Approximate dimensions: 14″ long (including shaft) × 4⅜″ wide × 4″ high. Classic rugged USA-made RF component ideal for high-power amateur radio transmitters, linear amplifiers, or antenna tuners. Ceramic insulated construction.
Genuine E.F. Johnson Co. dual-section air variable capacitor, Type/Cat. No. 50-150. Labeled 50–150 pF per section at 7500 volts with 0.125″ air gap. ¼-inch shaft. Approximate dimensions: 14″ long (including shaft) × 4⅜″ wide × 4″ high. Classic rugged USA-made RF component ideal for high-power amateur radio transmitters, linear amplifiers, or antenna tuners. Ceramic insulated construction.
Part identification: Nameplate shows Type or Cat. No. 50-150 (also marked CAP μμf 50-150, VOLTS 7500, AIR GAP .125). This is a dual-section E.F. Johnson air-variable capacitor. The “50-150” designation is the type/catalog marking for the capacitance range per section. No additional serial number is visible on the plate in the photos.Specs (from nameplate + your measurements + typical construction)
- Brand: E.F. Johnson Co., Waseca, Minn., U.S.A.
- Type / Part Number: 50-150
- Sections: 2 (dual)
- Labeled Capacitance: 50–150 pF per section (ratings apply to each section of multi-section condensers)
- Your measured Capacitance: Min ~26 pF / Max ~66 pF per section (actual measured values can differ from labeled due to measurement method, residual, or plate meshing; labeled range is the design rating)
- Voltage Rating: 7500 V
- Air Gap / Plate Spacing: 0.125″
- Shaft: ¼ inch
- Dimensions (approx.): Length including shaft 14″; Width 4⅜″; Height 4″
- Construction: Heavy aluminum frame and plates, ceramic (Steatite-style) insulators, typical rugged Johnson dual-section design with center support and rotor contacts. Suitable for high-power RF
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