JOHNSON 250E30 Air Capacitor E. F.

( Brand: Johnson ), ( Manufacturer Part Number: 250E30 ), ( Compatible Brand: Universal ), ( Type: Air Variable Capacitor ), ( Manufacturer Warranty: Expired ), ( Band: Hf ), ( Year Manufactured: Vintage ), ( Country/region Of Manufacture: United States ), ( To Fit: Ham Radio Amplifier, Ham Radio Transmitter )

Review JOHNSON Vintage E.. Type Air Variable Capacitor

The Johnson 250E30 Air Capacitor is a high-quality electrical component designed for various applications that require a reliable and efficient capacitor solution. This capacitor is a part of Johnson Controls' extensive range of capacitors, which are renowned for their durability and performance.

The Johnson 250E30 Air Capacitor is a non-polar capacitor, meaning it can be connected in either direction without affecting its performance. It has a voltage rating of 300 volts, making it suitable for moderate to high voltage applications. The capacitance value of this capacitor is 250 microfarads ( F), providing a decent energy storage capacity.

The capacitor is designed with a robust construction, featuring a durable aluminum case. The case is anodized for additional protection against corrosion, ensuring the capacitor's longevity even in harsh environments. The terminals are securely screwed to the case, providing a reliable electrical connection.

The Johnson 250E30 Air Capacitor is filled with air as the dielectric medium. Air capacitors are known for their high voltage rating and low loss, making them ideal for applications where high voltage, low inductance, and low power loss are required. The air in the capacitor is dried and purified to prevent moisture and impurities from affecting the capacitor's performance.

The capacitor is designed for easy installation and maintenance. It is lightweight and compact, making it easy to integrate into various systems. The terminals are labeled for easy identification of the positive and negative connections. The capacitor is also rated for a working temperature range of -40 C to 85 C, ensuring reliable performance in a wide range of temperature conditions.

In conclusion, the Johnson 250E30 Air Capacitor is a reliable and high-performance electrical component that is well-suited for various applications requiring a non-polar capacitor with a high voltage rating and low loss. Its robust construction, easy installation, and wide temperature range make it a versatile and reliable choice for many applications.

1. High Voltage Capability: The Johnson 250e30 air capacitor has a high voltage rating of 30kV, making it suitable for applications that require high voltage handling.

2. Large Capacitance: With a capacitance of 250 F, this capacitor can store a significant amount of energy, making it suitable for applications that require large energy storage.

3. Compact Design: The Johnson 250e30 air capacitor has a compact design, making it easy to install and integrate into various electrical systems.

4. Cost-Effective: Compared to other types of capacitors, such as film or electrolytic capacitors, air capacitors are generally more cost-effective.

1. Limited Frequency Response: Air capacitors have a limited frequency response, which means they may not be suitable for high-frequency applications.

2. Low Power Density: Air capacitors have a lower power density compared to other types of capacitors, which means they may not be suitable for applications that require high power handling.

3. Vulnerable to Environmental Factors: Air capacitors are vulnerable to environmental factors such as temperature, humidity, and pressure, which can affect their performance over time.

The Johnson 250e30 air capacitor is a suitable option for applications that require high voltage handling and large energy storage. Its compact design and cost-effectiveness make it an attractive option compared to other types of capacitors. However, its limited frequency response and low power density may make it less suitable for high-frequency applications or applications that require high power handling. It's important to consider these factors when deciding whether this capacitor is right for your specific application.

If you're looking for a high voltage and large capacitance capacitor for your application, the Johnson 250e30 air capacitor is a great option to consider. However, it's important to ensure that the capacitor's limited frequency response and low power density will not negatively impact the performance of your system. If you're unsure, consult with an electrical engineer or capacitor specialist to help you make an informed decision.

Details:

Not possible to do this with the phone app. The two mounting holes are on 5-3/8 centers. Carefully packed and promptly shipped with USPS, your choice of Ground Advantage or Priority. For your consideration is this Vintage E.

The 1/4 shaft is 3/4 long and features 360 rotation. The metal surfaces have some patina from age. Panel or chassis mounting. It is type 250E30, p/n 154-9.

Johnson Air Variable Capacitor with a published range of 20-251 pf. Examine the photos and judge for yourself. This rugged unit provides a large amount of capacity per cubic inch and extremely low to chassis.

part #: 250e30 prices

• $60.00-$128.00

specifications hamamateuradio:

• brand: Johnson
• mpn: 250e30
• compatible brand: Universal
• type: Air Variable Capacitor
• manufacturer warranty: Expired
• band: Hf
• year manufactured: Vintage
• country/region of manufacture: United States
• to fit: Ham Radio Amplifier, Ham Radio Transmitter

payments hamamateuradio:

• other
• credit card: Mastercard
• wallet: Paypal

returns hamamateuradio:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted
• method: Money back

general hamamateuradio:

• condition: Used
• Radio Communication > Ham, Amateur Radio > Other Ham Radio Equipment

shipping hamamateuradio:

• type: Calculated
• carrier: USPS
• transit: 2-6 Days
• cost: $8.25
• service: USPS Ground Advantage, USPS Priority Mail
• class: Standard, Expedited

seller hamamateuradio:

• # reviews: 3268
• rating: 100.0%
• city: Palatine, Illinois

offer hamamateuradio:

• availability: In Stock
• options: Ship-to-home
• sold: 0
• quantity: 1
• started: January 30, 2025

Johnson 250E30 Is Similar To:

• 100d70 Ef Johnson Air Variable Tuning Capacitor Gap Free Shipping (49.6% similar) Free shipping is included. Listing does not include anything mentioned in the and or shown photo's. 175 air gap. In good condition - no corrosion seen please see photos for personal evaluation. Up for bids is a eff Johnson 100D70 air variable tuning capacitor. Rated for 7000 volts...(November 2nd, 2018)
• 122-0247-1 Johnson One Vintage 247 (40% similar) Buyer pays return shipping. Includes the mounting ring Johnson socket is square brand new in original box which has some wear. Buyer pays actual shipping costs no handling charges. One vintage Johnson 247 ceramic transmitter tube socket nos in original box new old stock...(October 9th, 2017)
• 122-0247-202 Johnson 3 Vintage 247 (40% similar) Johnson sockets are square brand new in the original box which has some wear. 3 vintage Johnson 247 ceramic transmitter tube sockets nos in original box new old stock. Buyer pays actual shipping costs no handling charges. Buyer pays return shipping...(October 9th, 2017)
• 122-101-200 E Johnson Vintage 247 (36% similar) Johnson power tube socket in excellent condition. Free shipping. No major stains scuffs to the socket. Please see pics. It comes in original box. This is an : excellent condition...(December 27th, 2017)
• 149-0453-007 Ef Johnson Variable Capacitor Pf Nos Nib (47.7% similar) If you do not follow this procedure will receive any shipping discount for multiple items purchased. Someone has written in pencil 'abet 5-40 pf' but my measurements show it is 50 pf. I ship only to the us, Canada, western Europe, south America, Australia, new Zealand, Korea and japan. Mounting nut ...(August 1st, 2018)
• 150e30 Ef Johnson Tuning Capacitor Gap Pf Ham Radio Tuner Amp (35.9% similar) Caldwell variable capacitor picot farad. Great for an antenna tuner, amplifier, or other related project. Buyer pays the return shipping...(August 28th, 2018)
• 154-30 Johnson Pf Variable Capacitor (58.7% similar) Mint condition high voltage tuning capacitor removed from hf linear amp. 3KV 347PF max 25 pf minimum air variable...(April 17th, 2018)
• 154-503-1 E.f.johnson Nos Transmitting Air (26.5% similar) ...(March 30th, 2017)
• 154-505 Johnson Vintage Dual Mmf Variable Capacitor (67.3% similar) Sold for parts your build or tuner. Excellent except for marks on one of the top mounting tabs which has no effect performance cap. In the original box. Appears to be new old stock dual f capacitor...(May 22nd, 2018)
• 154-510 Johnson Transmitting Variable Capacitor Pf (56.6% similar) Overall, the length is inches including shafts. Mounting centers are inches. Johnson dual-section variable transmitting capacitor for your transmitter or antenna tuner project, part no. This is a used part, but it in excellent condition and ready to use. Each section is pf, and can be used ...(July 2nd, 2018)
• 155-13-8 Johnson Pce Hi Voltage Variable Please Read Description (48.3% similar) They have been checked to make sure turn smooth and no cracks in ceramic part or bent plates I can not find any data on these. Because the answer is no. Who have a bank account in USA. Packed so it will get to you undamaged. I only ship thru the USA postal service this works best for me and feel ...(June 15th, 2018)