RD Junior Deluxe

RD Junior Deluxe 

In 1950, Rogers introduced the RD Junior Deluxe, an improved version of their popular RD Junior amplifier.
This new model incorporated several significant upgrades:

• Improved tone control circuit, similar to that used in the Williamson pre-amplifier
• Increased negative feedback
• Low noise audio input stage using a Mullard EF40 tube
• Enhanced overall performance

Key Specifications:

• Power Output: 10 watts
• Frequency Response: ±0.2 dB from 20-20,000 Hz, -1.3 dB at 30,000 Hz
• Distortion:
  • At 8 watts: Not exceeding 0.5% total harmonics at 100 and 1,000 Hz
  • At 10 watts: 1% second and third harmonics at 100 and 1,000 Hz
• Sensitivity:
  • Radio input: 2V RMS for 10 watts output
  • Pickup input: 170 mV RMS for 10 watts output (at 1,000 Hz)
• Hum and Noise: Better than -65 dB in gram position (maximum gain, maximum bass boost, open grid circuit)
• Tone Controls: Variable slope type, ±18 dB range at 20 and 20,000 Hz, crossover at 1,000 Hz
• Pickup Compensation: 6 dB per octave from 250 Hz to 20 Hz
• Negative Feedback: 20 dB

The RD Junior Deluxe featured exceptionally low phase shift, ensuring unconditional stability under normal conditions.

It was available completely wired and tested in chassis form for £22 10s 0d. This upgraded model represented a significant improvement over the original RD Junior, offering enhanced sound quality and performance that Rogers claimed was unmatched in its price class.

In questo link sono elencati 39 modelli, di cui 39 con immagini e 6 con schemi.
Elenco delle radio e altri apparecchi della Rogers, Catford (see also Rogers Birmingham)