RD Junior

RD Junior Amplifier: A Classic Design

The Rogers RD Junior amplifier, introduced in 1949, was a simple yet effective integrated mono amplifier. Initially powered by PX4 output valves, it offered an output of 10 watts and was available in both kit form (£16.17s) and factory-built (£19.10s). Enthusiasts could also purchase a set of layout and circuit diagrams with a parts list for 7s. 6d.

As advertised in Wireless World in March 1949:

High-Fidelity Performance at Truly Low Cost

The RD Junior was designed to meet the needs of those seeking high performance at a reasonable price. Improved production methods, innovative circuitry, and the elimination of unnecessary components made this amplifier possible at a truly competitive price.

Key Features of the 1949 RD Junior:

• 6 valves plus rectifier
• 8-10 watts output (two PX4s in push-pull)
• Independent bass and treble tone controls
• High gain compensated phono input stage  
• Frequency range: 30-15,000 cps, ±1 dB
• Provision for radio feeder unit
• Ample negative feedback applied over three stages, including the output transformer
• High-quality components throughout, including Partridge transformers and chokes

Note: The Wireless World advert from June 1949 shows a picture of this amplifier with tone controls, confirming that this 1949 version included them.

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