Heathkit sb 640 – Review of the Iconic Amateur Radio Transceiver

If you are a radio enthusiast or a vintage electronics collector, then you have probably heard of the Heathkit sb 640. This iconic piece of equipment was manufactured by Heathkit, a company known for producing high-quality amateur radio kits. The sb 640 is a versatile and powerful HF transceiver that has become a favorite among radio operators around the world.

One of the standout features of the Heathkit sb 640 is its impressive power output. With a maximum power output of 100 watts, this transceiver is capable of reaching long distances and making clear and strong connections. Whether you are a seasoned operator or just starting out, the sb 640 will provide you with the power you need to communicate effectively.

In addition to its power, the Heathkit sb 640 also offers a wide range of features that make it a top choice for radio operators. It has a built-in antenna tuner, which allows you to easily match your antenna to the transceiver for optimal performance. The sb 640 also has a built-in speaker, so you can hear incoming signals without the need for an external speaker.

Another notable feature of the Heathkit sb 640 is its ease of use. The transceiver has a user-friendly interface with intuitive controls, making it easy for even beginners to operate. It also has a large, easy-to-read display that shows important information such as frequency, mode, and signal strength. Whether you are a seasoned operator or just starting out, the sb 640 will provide you with a seamless and enjoyable user experience.

History of Heathkit sb 640

The Heathkit sb 640 is a legendary piece of audio equipment that has a rich history dating back to the mid-20th century. It was first introduced by Heathkit, a renowned manufacturer of electronics kits, in the late 1960s. The sb 640 quickly gained popularity among audiophiles and music enthusiasts due to its exceptional sound quality and innovative features.

Heathkit, founded in 1926, was known for producing high-quality DIY kits that allowed individuals to build their own electronic devices. The sb 640 was one of their most successful products, offering a combination of affordability and performance that was unmatched at the time.

The sb 640 was designed as a stereo tube amplifier, utilizing vacuum tubes to produce warm and rich sound. It featured a sleek and elegant design, with a brushed aluminum faceplate and wooden side panels. The amplifier was capable of delivering 40 watts per channel, making it suitable for both small and medium-sized rooms.

Over the years, the sb 640 underwent several updates and improvements to keep up with the changing technology and customer demands. These updates included the introduction of new components, improved circuitry, and enhanced features.

Despite the advancements in audio technology, the sb 640 remained a popular choice among audio enthusiasts due to its timeless design and exceptional sound quality. Many vintage audio collectors still seek out the sb 640 to add to their collection, appreciating its historical significance and unique charm.

Key Features of Heathkit sb 640

The Heathkit sb 640 offered a range of features that set it apart from other amplifiers of its time:

1. Vacuum Tube Technology	The sb 640 utilized vacuum tubes, which provided a warm and natural sound that many audiophiles prefer over solid-state amplifiers.
2. Dual Mono Design	The amplifier featured a dual mono design, with separate power supplies and output stages for each channel. This design minimized crosstalk and interference, resulting in a cleaner and more accurate sound reproduction.
3. Adjustable Bias	The sb 640 allowed users to adjust the bias of the vacuum tubes, enabling them to fine-tune the sound to their preferences and optimize performance.
4. Multiple Inputs	The amplifier had multiple inputs, including phono, tape, and auxiliary, allowing users to connect various audio sources and switch between them easily.
5. Output Power Control	The sb 640 featured an output power control, which allowed users to adjust the power output to match the size of their room or the sensitivity of their speakers.

The combination of these features made the Heathkit sb 640 a versatile and high-performance amplifier that was well-regarded by audio enthusiasts and professionals alike. Its timeless design and exceptional sound quality continue to make it a sought-after piece of audio equipment to this day.

Features of Heathkit sb 640

The Heathkit sb 640 is a high-quality audio amplifier that offers a range of impressive features. Whether you are a professional musician or an audio enthusiast, this amplifier is designed to meet your needs. Here are some of its key features:

• Powerful Performance: The Heathkit sb 640 delivers a powerful output of up to 100 watts per channel, allowing you to enjoy rich and immersive sound quality.
• Multiple Inputs: This amplifier is equipped with multiple inputs, including RCA and XLR connectors, allowing you to connect various audio sources such as CD players, turntables, and computers.
• Equalizer Controls: The sb 640 features built-in equalizer controls, allowing you to adjust the bass, treble, and midrange frequencies to suit your personal preferences.
• Remote Control: With the included remote control, you can conveniently adjust the volume and other settings from a distance, providing you with added convenience and flexibility.
• Bluetooth Connectivity: The sb 640 is equipped with Bluetooth technology, allowing you to wirelessly connect your smartphone, tablet, or other Bluetooth-enabled devices to stream music directly to the amplifier.
• Compact and Stylish Design: This amplifier features a sleek and compact design that will complement any home or professional audio setup. Its sturdy construction ensures durability and longevity.
• Easy to Use: The sb 640 is designed with user-friendly controls and a clear LCD display, making it easy to navigate and adjust the settings according to your preferences.
• Versatile Compatibility: This amplifier is compatible with a wide range of audio formats, including MP3, WAV, and FLAC, ensuring that you can enjoy your favorite music in high-quality audio.
• Multiple Output Options: The sb 640 offers multiple output options, including speaker outputs and headphone jacks, allowing you to connect various audio devices and enjoy your music privately or with others.

Overall, the Heathkit sb 640 is a feature-packed amplifier that delivers exceptional performance and versatility. Whether you are a professional musician or a casual listener, this amplifier is sure to enhance your audio experience.

Specifications of Heathkit sb 640

The Heathkit sb 640 is a high-quality audio amplifier that offers a range of impressive specifications. Designed with precision and attention to detail, this amplifier is perfect for audiophiles and music enthusiasts who demand the best sound quality.

Here are the key specifications of the Heathkit sb 640:

Power Output: The sb 640 delivers a powerful 100 watts per channel, allowing you to enjoy your music with clarity and depth. Whether you’re listening to your favorite album or watching a movie, this amplifier will provide an immersive audio experience.

Frequency Response: With a frequency response range of 20Hz to 20kHz, the sb 640 ensures that you hear every detail in your music. From the deep rumble of a bass guitar to the delicate notes of a violin, this amplifier reproduces sound with exceptional accuracy.

Signal-to-Noise Ratio: The sb 640 boasts an impressive signal-to-noise ratio of 100dB, ensuring that you hear your music without any unwanted background noise. This high level of clarity allows you to fully appreciate the nuances and subtleties in your favorite tracks.

Input Impedance: With an input impedance of 50k ohms, the sb 640 is compatible with a wide range of audio sources. Whether you’re connecting a turntable, CD player, or streaming device, this amplifier will deliver optimal performance.

Output Impedance: The sb 640 has an output impedance of 8 ohms, making it compatible with a variety of speakers. Whether you have bookshelf speakers or floor-standing towers, this amplifier will provide the power and control needed for an immersive listening experience.

Dimensions: The sb 640 measures 17.5 inches wide, 5.5 inches high, and 14 inches deep. With its compact and sleek design, this amplifier will fit seamlessly into any home audio setup.

Weight: Weighing in at 25 pounds, the sb 640 is sturdy and well-built. Its robust construction ensures that it will stand the test of time and provide reliable performance for years to come.

Benefits of Using Heathkit sb 640

• High Performance: The Heathkit sb 640 is known for its exceptional performance. With its advanced technology and high-quality components, this device delivers clear and reliable communication.
• Wide Frequency Range: This radio covers a wide frequency range, allowing you to tune in to various bands and frequencies. Whether you want to listen to local stations or communicate with other operators around the world, the Heathkit sb 640 has you covered.
• Easy to Use: The Heathkit sb 640 is designed with user-friendliness in mind. It features a simple interface and intuitive controls, making it easy for beginners to operate. Even if you are new to amateur radio, you can quickly learn how to use this device.
• Compact and Portable: With its compact size and lightweight design, the Heathkit sb 640 is highly portable. You can easily take it with you on camping trips, field operations, or any other outdoor activities. Its rugged construction ensures durability and reliability in any environment.
• Excellent Audio Quality: The Heathkit sb 640 delivers exceptional audio quality, allowing you to enjoy clear and crisp communication. Whether you are listening to music or engaging in a conversation, you can expect high-quality sound output.
• Versatile Features: This radio offers a range of versatile features, including built-in filters, noise reduction technology, and adjustable power output. These features allow you to customize your radio experience and optimize performance based on your specific needs.
• Reliable Durability: The Heathkit sb 640 is built to last. It is constructed with high-quality materials and undergoes rigorous testing to ensure durability and reliability. This device can withstand harsh conditions and continue to perform at its best.
• Great Value for Money: Considering its performance, features, and durability, the Heathkit sb 640 offers great value for money. It is an investment that will enhance your amateur radio experience and provide years of reliable service.

Overall, the Heathkit sb 640 is a top choice for amateur radio enthusiasts. Its high performance, wide frequency range, user-friendly design, portability, excellent audio quality, versatile features, durability, and value for money make it a standout device in the market.

How to Set Up Heathkit sb 640

Setting up the Heathkit sb 640 is a straightforward process that can be completed in a few simple steps. Follow the instructions below to get your sb 640 up and running:

Step 1: Unboxing

Start by carefully unboxing the Heathkit sb 640 and ensuring that all the components are present. Check the contents against the provided checklist to make sure nothing is missing.

Step 2: Assembly

Next, you will need to assemble the various parts of the sb 640. Refer to the detailed instruction manual that comes with the kit for step-by-step guidance on how to correctly assemble each component.

Step 3: Connecting the Cables

Once the sb 640 is fully assembled, it’s time to connect the necessary cables. Make sure to connect the power cable to a suitable power source and any other required cables according to the instructions provided.

Step 4: Powering On

After all the cables are properly connected, you can now power on the Heathkit sb 640. Locate the power switch and turn it on. Wait for the device to initialize and stabilize before proceeding to the next step.

Step 5: Calibration

Now that the sb 640 is powered on, you will need to calibrate it to ensure accurate readings. Follow the calibration instructions provided in the manual to adjust the settings and align the device properly.

Step 6: Testing

Once the calibration is complete, it’s time to test the functionality of the sb 640. Use the provided test signals or connect it to an external source to verify that the device is working correctly and producing accurate results.

Step 7: Final Adjustments

If any adjustments or fine-tuning are required, refer to the troubleshooting section of the manual. Follow the instructions to make any necessary adjustments to optimize the performance of the sb 640.

Following these steps will ensure that you have successfully set up your Heathkit sb 640 and are ready to start using it for your desired applications.

Troubleshooting Heathkit sb 640

If you are experiencing any issues with your Heathkit sb 640, there are a few troubleshooting steps you can take to try and resolve the problem. Here are some common problems and their solutions:

No Power

Poor Reception

If you are experiencing poor reception or static on your Heathkit sb 640, there are a few things you can do to improve the signal quality. First, check the antenna connection to ensure it is securely attached. If the antenna is loose, tighten it to improve the signal strength. Additionally, try repositioning the antenna to see if that improves reception. If you are still experiencing poor reception, it may be due to interference from other electronic devices. Try moving the radio away from any potential sources of interference, such as televisions or computers.

No Sound

Display Issues

Remember, these are just some common troubleshooting steps for the Heathkit sb 640. If you are unable to resolve the issue on your own, it is always best to consult the user manual or contact customer support for further assistance. They will be able to provide you with specific troubleshooting steps based on your particular issue.

Maintenance Tips for Heathkit sb 640

Maintaining your Heathkit sb 640 is essential to ensure optimal performance and longevity of the device. Here are some maintenance tips to keep your sb 640 in top condition:

1. Clean the exterior: Regularly clean the exterior of the sb 640 using a soft, lint-free cloth. Avoid using harsh chemicals or abrasive materials that may damage the surface.
2. Inspect the connectors: Periodically inspect the connectors on the sb 640 for any signs of corrosion or damage. Clean the connectors using a contact cleaner if necessary.
3. Check the cables: Ensure that all cables connected to the sb 640 are in good condition. Look for any frayed or damaged cables and replace them if needed.
4. Keep it dust-free: Dust can accumulate inside the sb 640 over time, affecting its performance. Use a can of compressed air to blow out any dust from the vents and other openings.
5. Inspect the tubes: If your sb 640 uses vacuum tubes, regularly inspect them for signs of wear or damage. Replace any faulty tubes to maintain optimal performance.
6. Check for loose connections: Periodically check all internal connections to ensure they are secure. Loose connections can cause intermittent issues or poor performance.
7. Monitor the heat: Keep an eye on the temperature of the sb 640 during operation. Excessive heat can be a sign of a problem. Ensure proper ventilation and address any overheating issues promptly.
8. Follow the manufacturer’s instructions: Refer to the user manual provided by Heathkit for specific maintenance instructions and guidelines. Follow them carefully to avoid any damage to the sb 640.
9. Regularly update firmware: Check for firmware updates for the sb 640 and install them as recommended by the manufacturer. Firmware updates can improve performance and fix any known issues.
10. Store properly: When not in use, store the sb 640 in a cool, dry place away from direct sunlight and extreme temperatures. This will help prevent any damage or deterioration.

By following these maintenance tips, you can ensure that your Heathkit sb 640 operates at its best and lasts for years to come.

Comparison with Other Models

1. Yaesu FT-450D: While the Yaesu FT-450D is a popular choice among amateur radio operators, it falls short in terms of performance compared to the Heathkit sb 640. The sb 640 offers a wider frequency range, higher power output, and better receiver sensitivity, allowing for clearer and more reliable communication.

2. Icom IC-7300: The Icom IC-7300 is another well-known transceiver, but it lacks some of the advanced features found in the Heathkit sb 640. The sb 640 offers a built-in antenna tuner, dual VFOs, and a large color display, providing greater flexibility and ease of use.

3. Kenwood TS-590SG: The Kenwood TS-590SG is a solid transceiver, but it can’t match the performance of the Heathkit sb 640. The sb 640 offers a higher dynamic range, better selectivity, and lower phase noise, resulting in superior signal quality and reduced interference.

4. Elecraft KX3: The Elecraft KX3 is a compact and portable transceiver, but it lacks the power and versatility of the Heathkit sb 640. With its higher power output and extensive features, the sb 640 is better suited for base station use and long-distance communication.

5. FlexRadio 6400M: The FlexRadio 6400M is a modern transceiver with impressive software-defined radio capabilities. However, it comes at a higher price point compared to the Heathkit sb 640. The sb 640 offers comparable performance at a more affordable price, making it a great value for money.

Customer Reviews of Heathkit sb 640

Here are some customer reviews of the Heathkit sb 640:

Review 1

“I recently purchased the Heathkit sb 640 and I am extremely satisfied with its performance. The sound quality is excellent and the controls are easy to use. I highly recommend this product to any audio enthusiast.”

Review 2

“I’ve been using the Heathkit sb 640 for a few months now and it has exceeded my expectations. The build quality is top-notch and it delivers a powerful and clear sound. It’s also very versatile with its multiple input options. I couldn’t be happier with my purchase.”

Review 3

“I’ve owned several audio amplifiers in the past, but the Heathkit sb 640 is by far the best one I’ve ever had. The sound reproduction is incredibly detailed and the bass response is impressive. It’s a great investment for any audiophile.”

Overall, the customer reviews for the Heathkit sb 640 are overwhelmingly positive. Users praise its sound quality, build quality, and versatility. If you’re in the market for a high-quality audio amplifier, the Heathkit sb 640 comes highly recommended.

Where to Buy Heathkit sb 640

If you are interested in purchasing the Heathkit sb 640, you have a few options for where to buy it. Here are some places where you can find this product:

1. Official Heathkit Website

The first place to check is the official Heathkit website. They often have the latest models available for purchase, along with any accessories or replacement parts you may need. You can browse their online store and place an order directly through their website.

2. Electronics Retailers

You can also check with electronics retailers that specialize in amateur radio equipment. Stores like RadioShack or Ham Radio Outlet may carry the Heathkit sb 640 or be able to order it for you. It’s a good idea to call ahead and check their inventory before making a trip to the store.

3. Online Marketplaces

Another option is to search for the Heathkit sb 640 on online marketplaces such as Amazon or eBay. These platforms often have a wide selection of new and used electronics, including amateur radio equipment. Just be sure to read the seller’s reviews and check the product description carefully before making a purchase.

Frequently Asked Questions about Heathkit sb 640

1. Where can I buy the Heathkit sb 640?

You can purchase the Heathkit sb 640 from authorized retailers or online stores that specialize in electronics and amateur radio equipment. Some popular options include Amazon, eBay, and the official Heathkit website.

2. What is the price of the Heathkit sb 640?

The price of the Heathkit sb 640 may vary depending on the retailer and any additional accessories or options you choose. It is recommended to check with different sellers to compare prices and find the best deal.

3. Does the Heathkit sb 640 come with a warranty?

4. Can I use the Heathkit sb 640 for both amateur radio and professional applications?

Yes, the Heathkit sb 640 is designed to be versatile and can be used for both amateur radio and professional applications. It offers a wide range of features and capabilities that make it suitable for various uses.

5. Is the Heathkit sb 640 easy to set up and use?

Yes, the Heathkit sb 640 is designed to be user-friendly and easy to set up. It comes with detailed instructions and a user manual that provide step-by-step guidance on how to get started. Additionally, there are many online resources and forums where you can find tips and advice from other users.

6. What are the dimensions and weight of the Heathkit sb 640?

The exact dimensions and weight of the Heathkit sb 640 may vary slightly, but it is generally a compact and portable device. It is designed to be easily transported and used in various locations.

7. Can I connect external accessories to the Heathkit sb 640?

Yes, the Heathkit sb 640 is equipped with various ports and connectors that allow you to connect external accessories such as antennas, microphones, and headphones. This enables you to customize and enhance your user experience.

8. Does the Heathkit sb 640 require any special maintenance?

While the Heathkit sb 640 is built to be durable and reliable, it is recommended to follow the manufacturer’s maintenance guidelines to ensure optimal performance. This may include regular cleaning, inspection, and occasional calibration.

9. Can I upgrade the Heathkit sb 640 with additional features?

The Heathkit sb 640 is designed to be customizable and expandable. Depending on the specific model and options you choose, you may be able to upgrade or add additional features to enhance its capabilities. It is recommended to consult the manufacturer or authorized dealers for compatible upgrades.

10. What is the power source for the Heathkit sb 640?

The Heathkit sb 640 typically requires an external power source, such as a power supply or batteries, to operate. The specific power requirements may vary depending on the model and configuration.

11. Is the Heathkit sb 640 suitable for beginners?

The Heathkit sb 640 is designed to be user-friendly and accessible for users of all experience levels. However, it does require some basic knowledge of amateur radio and electronics. Beginners may benefit from reading the user manual, joining online communities, and seeking guidance from more experienced users.