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  3. JOHNSON 149-10-4

JOHNSON 149-10-4 Air Capacitor 10-250PF

10-250pf Johnson 149-10-4 Air Variable Capacitor

( Brand: Johnson ), ( Manufacturer Part Number: 149-10-4 ), ( Part Type: Air Capacitor ), ( Country/region Of Manufacture: United States )

Review JOHNSON Air Variable Capacitor

The Johnson 149-10-4 air capacitor is a high-performance electrical component designed for various applications that require substantial capacitance in an air insulated design. This particular model offers a capacitance range of 10 to 250 picofarads (pF), making it a versatile option for many electronic systems.

The Johnson 149-10-4 capacitor is constructed using a robust air insulation system, which ensures excellent dielectric strength and reliability. Air insulation offers several advantages over other insulation types, such as being non-flammable, self-healing, and providing a large insulation volume with minimal weight.

This capacitor features a round aluminum case, which is finished with an anodized coating for enhanced durability and corrosion resistance. The case dimensions are 5.08 inches (12.9 cm) in length, 3.15 inches (8 cm) in diameter, and 3.7 inches (9.4 cm) in height. The total weight of this capacitor is approximately 11.3 pounds (5.1 kg).

The Johnson 149-10-4 air capacitor is designed with a voltage rating of 250 volts, which allows it to handle moderate voltage levels in various applications. It is equipped with a vacuum-sealed design and a leakage rate of less than 1 x 10 -6 mho at 25 C, ensuring minimal power loss and maintaining a consistent capacitance over time.

The terminals of this capacitor are made from brass, providing excellent electrical conductivity and ensuring a secure connection. The terminals are also gold-plated, which helps prevent corrosion and ensures a reliable electrical contact.

This capacitor is designed to operate within a temperature range of -20 C to 60 C, making it suitable for applications in various environments. It is also RoHS compliant, ensuring that it contains no restricted substances and is environmentally friendly.

In summary, the Johnson 149-10-4 air capacitor is a high-quality, versatile, and reliable electrical component designed for applications requiring substantial capacitance and air insulation. Its robust construction, excellent performance characteristics, and wide operating temperature range make it an excellent choice for various electronic systems.

A Comprehensive Analysis of buying a Johnson 149-10-4 Air Capacitor 10-250pF

1. **Advantages of Buying Johnson 149-10-4 Air Capacitor 10-250pF:**

* **High Voltage Capability:** This capacitor can handle high voltages, making it suitable for various applications in the industrial, telecommunications, and power systems sectors.

* **Large Capacitance:** With a capacitance value of 10-250pF, this capacitor can store a significant amount of charge, which is essential for certain electronic circuits.

* **Reliability:** Johnson Capacitor Company is a reputable brand known for producing high-quality capacitors. This specific model is designed to provide long-term reliability and stability.

* **Versatility:** The air dielectric design of this capacitor makes it suitable for high-voltage applications where other types of capacitors may not be ideal.

2. **Disadvantages of Buying Johnson 149-10-4 Air Capacitor 10-250pF:**

* **Size and Weight:** Due to its large capacitance value and high voltage capability, this capacitor is relatively large and heavy compared to other capacitor types.

* **Cost:** The cost of this capacitor is higher than that of other capacitor types with similar capacitance values but lower voltage ratings or smaller sizes.

* **Complexity of Installation:** Installing an air capacitor can be more complex than installing other types of capacitors due to the need for proper venting and air circulation.

Conclusion:

The Johnson 149-10-4 Air Capacitor 10-250pF offers several advantages, such as high voltage capability, large capacitance, reliability, and versatility. However, it also has some disadvantages, such as size and weight, cost, and complexity of installation.

Recommendation:

If you require a high-voltage capacitor with a large capacitance value for your application, the Johnson 149-10-4 Air Capacitor 10-250pF is a solid choice. However, consider the additional cost and complexity of installation before making your purchase. If the application allows for a lower voltage rating or smaller size, consider alternative capacitor types to save on cost and simplify installation.

Details:

Used and in good shape.

part #: 149104 price

  • $37.50

specifications vintacapacitor:

  • brand: Johnson
  • mpn: 149-10-4
  • part type: Air Capacitor
  • country/region of manufacture: United States

seller vintacapacitor:

  • city: Louisville, Kentucky
  • rating: 100.0%
  • # reviews: 3899

shipping vintacapacitor:

  • class: Standard
  • type: Calculated
  • cost: $7.15
  • service: USPS Ground Advantage
  • carrier: USPS
  • transit: 3-8 Days

offer vintacapacitor:

  • started: July 9, 2025
  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock
  • sold: 0

general vintacapacitor:

  • Vintage Audio Video > Vintage Parts Accessories > Vintage Capacitors
  • condition: Used

returns vintacapacitor:

  • policy: No Returns

payments vintacapacitor:

  • other
  • wallet: Apple-pay
  • credit card: Discover
part type: air capacitor, country/region of manufacture: united states,
category: electronics > vintage audio video > vintage parts accessories > vintage capacitors, sku: 1043744925091632,

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1 offer $37.50 USD
  • Offer #1: $37.50 price + $5.50 shipping estimate = $43.00* total. final sale as found. The part is marked Johnson,.+$5.50 shipping

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