Williamson Amplifier

In 1954, Radford Electronics Ltd manufactured their version of the renowned Williamson amplifier, a design that had set the standard for high-fidelity sound reproduction since its introduction in 1947. 

The Radford-manufactured Williamson amplifier featured the following technical specifications and characteristics:

Circuit Design

• The amplifier utilised a five-valve configuration, adhering closely to the original Williamson design. It likely employed:
• A four-stage topology with push-pull, Class A triode output
• Global negative feedback of approximately 20 dB
• Triode-connected output valves, possibly KT66 or similar

Performance

• Output Power: Approximately 15-20 watts RMS
• Total Harmonic Distortion: Likely no more than 0.1% at full output
• Frequency Response: Extremely wide, possibly 10-20,000 Hz ±0.2 dB (Advertised as 5 Hz – 300 kHz ±2 dB)
• Phase Shift: Minimal within the audible range

Features

• Multiple output impedances available to suit various requirements
• Chassis finished in Alpine Mist metalchrome, indicating attention to aesthetics
• Priced at £32 10s, reflecting its premium positioning in the market

Applications

The Radford-manufactured Williamson amplifier was not only designed for high-fidelity sound reproduction but also found widespread use in laboratories worldwide. Its extremely wide frequency response and low distortion made it suitable for precise linear amplification applications.

This version of the Williamson amplifier likely maintained the original design's emphasis on high-quality components, particularly the output transformer, which was crucial to achieving the amplifier's exceptional performance. The Radford implementation would have aimed to preserve Williamson's reputation for setting the standard in design and performance in audio reproduction

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