The Collins 26W Limiting Amplifier holds historical significance as an essential piece of audio equipment used in broadcasting and recording industries during the mid-20th century. Manufactured by Collins Radio Company, which was known for producing high-quality communication and broadcasting equipment, the 26W played a crucial role in ensuring consistent and reliable audio transmission.
Key historical aspects of the Collins 26W include:
- Broadcasting Legacy: The Collins 26W was commonly used in AM and FM radio stations to prevent audio overmodulation, which could lead to signal distortion or regulatory violations. By limiting the amplitude of audio peaks, it allowed stations to maintain audio quality and comply with broadcasting standards.
- Technological Advancements: During its time, the 26W was considered advanced due to its ability to provide stable audio limiting with minimal distortion. Its design incorporated a robust set of vacuum tubes, which were typical for amplifiers of that era, contributing to its reliable performance in various broadcasting environments.
- Contribution to High-Quality Transmission: By improving the signal-to-noise ratio and allowing for a higher average modulation level, the 26W enabled stations to transmit clearer and stronger signals over larger distances. This was especially important in an era when broadcasting reach and clarity were key competitive advantages for radio stations.
- Historical Context: The Collins Radio Company, founded in 1933, was highly regarded for its innovations in radio communication, avionics, and broadcasting equipment. Products like the 26W amplified the company’s reputation as a leader in high-fidelity audio equipment and reliable transmission technology.
The Collins 26W is remembered as part of the golden age of radio broadcasting when technical quality and innovation were rapidly evolving. It exemplified the period’s engineering craftsmanship and played a role in shaping the broadcasting industry by setting standards for audio limiting and signal control.
Collins 26W Manufacturer Description
The Collins 26W Limiting Amplifier is intended for use in any AM or FM setup where controlling audio frequency peak levels is required. In transmitter applications, it prevents overmodulation by limiting loud audio sections. This function enables a higher average modulation level, increasing the transmission range or signal coverage area and enhancing the overall transmitter efficiency. When paired with recording equipment or public address systems, it helps avoid overloading and raises the average audio level, thereby improving the signal-to-noise ratio.
The Collins 26W Limiting Amplifier is designed for mounting in any standard 19″ relay rack or cabinet, such as the Collins Type 19G-2 or 19G-3. It requires 14″ of vertical mounting space. The equipment is built on a vertical chassis, allowing all wiring and circuit components to be easily accessed by removing a dust cover at the back. The front panel has a hinged door for tube access, and the chassis is open at both the top and bottom to ensure proper ventilation for tubes and transformers.
The Collins 26W Limiting Amplifier is a versatile program amplifier equipped with features to prevent the peak output signal from surpassing a predetermined level. It includes metering facilities for continuous visual monitoring of operating conditions and comes with an integrated power supply.
Vacuum Tube Complement:
- 1 x 6N7: Input amplifier
- 1 x 6N6GT/G: Limiter control
- 1 x 1261 (6F6): Output amplifier
- 1 x 5V4G: Rectifier
