974-0464-00 SIGMA Relay Collins Wwii Radio

Review SIGMA Spec Relay Collins Wwii Era Radio

The Sigma 974-0464-00 relay, also known as Collins 90581, is a vital component for radio enthusiasts and collectors who own WWII-era Collins radios. This specific model is a high-quality electromechanical relay, which serves as a switching device for various electrical circuits in the radio system.

The Collins 90581 relay is meticulously crafted to provide reliable and consistent performance. It is constructed with high-quality materials, ensuring durability and longevity. The relay features 12 contacts, which are gold-plated to ensure superior conductivity and minimize contact resistance. Gold-plating also protects the contacts from oxidation and corrosion, enabling the relay to maintain its performance over an extended period.

This relay operates on a 12V DC power supply and is designed for use in harsh environments, making it suitable for military and industrial applications. It measures approximately 1.6 inches in length, 1.2 inches in width, and 0.8 inches in height. With a contact rating of 1 ampere and a coil resistance of 180 ohms, the relay can handle a reasonable current flow while maintaining a reasonable power consumption.

The Sigma 974-0464-00 relay comes with a clear, protective cover that shields the contacts from dust, debris, and accidental contact. Its robust design and high-quality construction ensure that it can withstand the rigors of daily use without compromising its performance.

For those who own and restore Collins WWII radios or other vintage radio equipment, this relay is an essential component. Its reliable operation and high-quality construction make it a valuable addition to any collection or restoration project. For radio hobbyists and enthusiasts, the Collins 90581 relay is an investment in preserving history and ensuring the continued functionality of these iconic and historically significant devices.

Sigma 974-0464-00 Relay for Collins WWII Radio: A Valuable Investment?

The Sigma 974-0464-00 relay is a crucial component for the Collins WWII S-line 303 and 305 radios. This relay is responsible for several essential functions, including the operation of the receiver's automatic gain control (AGC) and the transmission keying. In this analysis, we will discuss the pros and cons of purchasing this relay to restore or maintain Collins WWII radios.

1. Authenticity: This relay is an original component, manufactured by Sigma, specifically designed for Collins WWII radios. Using an original part ensures the best fit and performance.

2. Functionality: The Sigma 974-0464-00 relay offers excellent functionality. It is designed to handle the high power requirements and complex circuitry of Collins WWII radios, ensuring reliable operation.

3. Availability: Original Collins parts can be hard to find, especially for older models. Purchasing this relay from a reputable dealer guarantees availability and eliminates the risk of receiving a non-functional or incorrect part.

1. Cost: Original Collins components, such as the Sigma 974-0464-00 relay, can be expensive due to their rarity and historical significance.

2. Complexity: Installing the relay may require some technical expertise. Working on Collins WWII radios involves handling high voltages and complex circuits, so it is essential to be well-versed in radio repair and familiar with the specific model.

The Sigma 974-0464-00 relay is a valuable investment for those restoring or maintaining Collins WWII S-line 303 and 305 radios. Its authenticity, functionality, and availability make it a worthwhile purchase for enthusiasts and collectors. However, the cost and complexity of installation should be considered before making a decision.

If you are a Collins WWII radio enthusiast or collector, this relay is a recommended addition to your toolkit or restoration project. Ensure that you purchase the relay from a reputable dealer to guarantee its authenticity and functionality. Additionally, consider investing in proper tools and resources to ensure safe and successful installation.

Details:

Please see photos for more details. These are from a long time collector who used and saved thousands of components during his career.

specifications genpurrelays:

• brand: Sigma
• mpn: 974-0464-00
• part type: Radio

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• in stock #: 1
• started: march 21, 2026
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