EF Johnson
E.F. Johnson 153-505-1 / Type 500 DD 35 Dual Section Air Variable Capacitor 500 pF Each
- MPN:
- 153-505-1 / Type 500 DD 35
- Condition:
- Used
- Shipping:
- $28.00 (Fixed Shipping Cost)
Frequently bought together:
Description
E.F. Johnson 153-505-1 / Type 500 DD 35 Dual Section Air Variable Capacitor 500 pF Each
EF Johnson Dual Air Variable Capacitor – 153-505-1 (500 DD 35)
Genuine E.F. Johnson Co. (Waseca, Minn.) dual-section air variable, catalog 153-505-1 / Type 500 DD 35. Each section rated approximately 40–509 pF @ 3500 volts with 0.080" air gap. ¼" shaft, overall dimensions 15½" L × 4 3/16" W × 4" H. Classic rugged Type D construction with aluminum plates/frames and steatite insulators. Perfect for high-power ham radio linear amplifiers, antenna tuners, or RF matching networks. Clean used condition with factory stamping intact. Contact for additional photos, condition details, shipping, and current price. Proven mid-century Johnson quality for serious operators.
Genuine E.F. Johnson Co. (Waseca, Minn.) dual-section air variable, catalog 153-505-1 / Type 500 DD 35. Each section rated approximately 40–509 pF @ 3500 volts with 0.080" air gap. ¼" shaft, overall dimensions 15½" L × 4 3/16" W × 4" H. Classic rugged Type D construction with aluminum plates/frames and steatite insulators. Perfect for high-power ham radio linear amplifiers, antenna tuners, or RF matching networks. Clean used condition with factory stamping intact. Contact for additional photos, condition details, shipping, and current price. Proven mid-century Johnson quality for serious operators.
Exact part number / type (stamped on end plate): 153-505-1
This is the dual-section Type D catalog number corresponding to Type/Cat. No. 500 DD 35 (or 500DD35). The “-1” suffix typically indicates a minor production or shaft/mounting variation of the standard 153-505.Confirmed specifications:
This is the dual-section Type D catalog number corresponding to Type/Cat. No. 500 DD 35 (or 500DD35). The “-1” suffix typically indicates a minor production or shaft/mounting variation of the standard 153-505.Confirmed specifications:
- Number of sections: 2 (electrically isolated, mechanically ganged on a common shaft).
- Capacitance: Maximum ≈509 pF per section (catalog rating 500 pF / ≈496 pF); minimum ≈40 pF per section (catalog ≈38 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 4 3/16", Height 4".
- Construction: Aluminum plates and end frames, low-loss steatite insulators, center rotor contact for electrical symmetry. Typical plate count ≈39 per section. Ratings apply to each section.
- Typical use: High-power RF applications including ham radio linear amplifiers, antenna tuners, and matching networks.
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