RD Junior De-Luxe Improved

The improved RD Junior De-Luxe amplifier, introduced in September 1951, featured significant upgrades that enhanced its performance and capabilities from the 1950 RD Junior Deluxe:

Output Stage

The amplifier was equipped with a KT66 push-pull output stage, capable of delivering 10 watts of undistorted output. This configuration likely contributed to improved sound quality and increased power handling.

Performance Specifications
Frequency Response:

• Within ±0.25 dB from 30 Hz to 20,000 Hz

Distortion:

• Not exceeding 0.25% at 1,000 Hz

Input Sensitivity:

• 78 RPM Standard Pickup: 120 mV
• 33 RPM LP Pickup: 80 mV
• Radio: 200 mV

Tone Control
The amplifier featured bass and treble controls with an impressive range of ±18 dB, allowing for significant sound-shaping capabilities.

Feedback
Negative feedback was applied to all stages, with the main loop (including the output transformer) providing 20 dB of feedback. This likely contributed to reduced distortion and improved overall performance.

Pricing
The improved RD Junior De-Luxe amplifier was priced at £25, reflecting its enhanced features and performance capabilities.
This upgraded version represented a significant step forward in amplifier design, offering improved power output, lower distortion, and enhanced control options compared to its predecessor.
The use of the KT66 push-pull output stage was particularly noteworthy, as it allowed for increased power handling and potentially better sound quality.

Here you find 39 models, 39 with images and 6 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Rogers, Catford (see also Rogers Birmingham)