EF Johnson
EF Johnson 500 DD 35 Dual Section Air Variable Capacitor 500pF Each 3500 Volt
- MPN:
- 153-505
- Condition:
- Used
- Shipping:
- $28.00 (Fixed Shipping Cost)
Frequently bought together:
Description
EF Johnson 500 DD 35 Dual Section Air Variable Capacitor 500pF Each 3500 Volt. Great Loading Capacitor!
Type or Cat. No. 500 DD 35 (also written 500DD35).
Serial No. 38-476.
This corresponds to the dual-section Type D catalog entry 153-505. Confirmed specifications:
Serial No. 38-476.
This corresponds to the dual-section Type D catalog entry 153-505. Confirmed specifications:
- Number of sections: 2 (electrically isolated, mechanically ganged on a common shaft).
- Capacitance: Maximum 500 pF (µµF) per section; minimum approximately 35 pF per section (catalog values typically list ≈38–496 pF).
- Voltage rating: 3500 V (peak/withstanding).
- Air gap / plate spacing: 0.080".
- Shaft: ¼ inch (extends both ends).
- Dimensions (including shafts): Length 15½", Width 4⅝", Height 4".
- Construction: Heavy aluminum end frames and plates, low-loss steatite insulators, center rotor contact for electrical symmetry. Typical plate count ≈39 per section. Ratings on the label apply to each section of multi-section units.
- Typical use: High-power RF applications including ham radio linear amplifiers, antenna tuners, and matching networks.
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Sections 2
Capac