EF Johnson
EF Johnson 100 DD 90, Dual Section Air Variable Capacitor 30-100 pF Per Section, 9000V, 1/4" Shaft
- MPN:
- 100 DD 90
- Condition:
- Used
- Shipping:
- $25.00 (Fixed Shipping Cost)
Frequently bought together:
Description
EF Johnson 100 DD 90, Dual Section Air Variable Capacitor 30-100 pF Per Section, 9000V, 1/4" Shaft in Excellent Condition.
EF Johnson Air Variable Capacitor – Part 100 DD 90
Genuine dual-section EF Johnson Type D air variable capacitor. Specs: 2 sections, 30–100 pF each, 9000 V rating, ¼-inch shaft. Dimensions approx. 17″ L (including shaft) × 4¼″ W × 4″ H. Classic high-quality USA-made RF component ideal for high-power amateur radio transmitters, amplifiers, or antenna tuners. Rugged construction with aluminum plates and Steatite insulation. Excellent for restoration or new high-voltage projects. Contact for condition details and current pricing.
Genuine dual-section EF Johnson Type D air variable capacitor. Specs: 2 sections, 30–100 pF each, 9000 V rating, ¼-inch shaft. Dimensions approx. 17″ L (including shaft) × 4¼″ W × 4″ H. Classic high-quality USA-made RF component ideal for high-power amateur radio transmitters, amplifiers, or antenna tuners. Rugged construction with aluminum plates and Steatite insulation. Excellent for restoration or new high-voltage projects. Contact for condition details and current pricing.
- Brand / Type: EF Johnson (E.F. Johnson) Air Variable Capacitor, Type D dual-section (high-voltage series).
- Part Number: 100 DD 90 (also referenced as 100DD90 / catalog ~153-514).
- Sections: 2.
- Capacitance: Approximately 30–97/100 pF per section (catalog lists ~30 pF min / 97 pF max; your rating of 30–100 pF is consistent).
- Voltage rating: 9000 V (peak; corresponding to ~0.250″ plate spacing).
- Plates: Catalog lists ~19 plates (for the 100DD90).
- Shaft: ¼ inch (cadmium-plated or similar; typical for these).
- Dimensions: Length ~17″ including Shaft (catalog body length closer to ~14⅞″; Width 4¼″; Height 4″.)
- Construction notes (typical for Type C/D): Heavy aluminum end frames, ~0.051″ plates, 5/16″ tie rods for rigidity, low-loss Steatite insulators outside intense RF fields, laminated phosphor-bronze rotor contacts (dual models often have center rotor contact for symmetry). Designed for medium-power RF equipment.
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