HEATHKIT SB-240 Linear Amplifier Prototype 2KW

( Brand: Heathkit ), ( Manufacturer Part Number: SB-240 ), ( Model: HEATHKIT SB-240 ), ( Type: Linear Amplifier )

Review HEATHKIT Extremely Rare 2kw Linear Amplifier One Of Ten Prototype Made

The Heathkit SB-240 2KW Linear Amplifier Prototype is a remarkable piece of engineering, designed for high-power amateur radio applications. This amplifier, a testament to Heathkit's commitment to quality and innovation, is a 2-kilowatt linear amplifier that delivers exceptional performance in the HF (High Frequency) band.

The SB-240 is a kit that requires assembly, offering a rewarding hands-on experience for hobbyists and enthusiasts. The kit includes a comprehensive instruction manual, making the assembly process accessible to both beginners and experienced electronics builders.

The amplifier's core is a sturdy, powder-coated steel chassis, which houses the high-quality components that make up the SB-240. These components include four 1000W transistors, a 160-10 meter bandpass filter, and a 160-40 meter automatic tuning unit. The amplifier's output is adjustable from 1.3 to 2 kilowatts, allowing for fine-tuning to suit specific operating conditions.

The SB-240 features a user-friendly front panel with a power meter, SWR meter, and a keying circuits for CW and phone operation. The amplifier is designed to be efficient, with a typical plate efficiency of 55%, ensuring minimal power loss and maximizing output power.

The Heathkit SB-240 2KW Linear Amplifier Prototype is a versatile and powerful tool for amateur radio operators, providing reliable performance and the satisfaction of a DIY build. With its robust construction, high power output, and adjustable settings, this amplifier is a valuable addition to any amateur radio station.

The Heathkit SB-240 2kw Linear Amplifier Prototype is a high-power amateur radio amplifier, originally manufactured by Heathkit. Here are the pros and cons of buying this amplifier:

1. High Power Output: The SB-240 delivers 2kw of power, which is significantly more than many other amateur radio amplifiers, making it ideal for long-distance communications and weak signal work.

2. Reputation: Heathkit is a well-known and respected brand in the ham radio community, known for producing high-quality kits and components.

3. Build Quality: As a prototype, the SB-240 is built with high-quality components, which can lead to a longer lifespan and better performance.

4. Learning Experience: Building a Heathkit kit can be a rewarding experience, as it allows you to gain a deeper understanding of how the components work together.

1. Complexity: The SB-240 is a complex device, and building it requires a good understanding of electronics and radio frequency (RF) circuitry.

2. Cost: Given its complexity and power output, the SB-240 is a relatively expensive amplifier.

3. Availability: As a prototype, the SB-240 is not widely available, and you may have to search for a used model.

4. Maintenance: High-power amplifiers like the SB-240 require regular maintenance to ensure they continue to perform optimally.

The Heathkit SB-240 2kw Linear Amplifier Prototype is a high-quality, high-power amateur radio amplifier that can provide excellent performance for long-distance communications. However, its complexity, cost, availability, and maintenance requirements should be carefully considered before making a purchase. If you have the necessary skills and are willing to invest the time and money, the SB-240 can be a rewarding addition to your ham radio setup. If not, there are other, less complex and more affordable amplifiers available that may better suit your needs.

Details:

Due to the vintage age of electronics unit is sold as-is. Features included: Two reliable 3-500Z tubes A plug-in transformer SSB/CW switchable power supply 1 KW CW/SSB or 2 SSB Temperature controlled two-stage fan Overdrive grid current lock out protection up to 5:1 SWR Zero signal plate Normal and overdrive Leds Metering of forward PEP, reflected power, current, high voltage requires less than 100 W drive Coverage 80, 40, 20, 15, 10 meters 230 VAC 125 supply, This unit is serial #007, accordingly those in the know there only three prototypes still existence. Shipping is free to CONUS. The SB-240 has been described as an SB-220 on steroids.

This particular unit was built in the cabinet and color of SB-104 A station design. Extremely Rare Heathkit SB-240 HF 2KW Linear Amplifier one of only ten prototype made, If you've never heard the you would be forgiven, since it came to market.

part #: sb240 prices

• $620.00-$1145.00

specifications hamamateuradio:

• brand: Heathkit
• mpn: Sb-240
• model: Heathkit Sb-240
• type: Linear Amplifier

shipping hamamateuradio:

• type: Calculated
• class: Standard
• service: FedEx Ground / FedEx Home Delivery
• cost: $0.00
• transit: 6-12 Days
• carrier: FedEx

seller hamamateuradio:

• city: Titusville, Florida
• rating: 100.0%
• # reviews: 346

general hamamateuradio:

• Radio Communication > Ham, Amateur Radio > Ham Radio Amplifiers
• condition: Used

payments hamamateuradio:

• other
• credit card: Mastercard
• wallet: Paypal

offer hamamateuradio:

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

returns hamamateuradio:

• policy: No Returns

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