Ravensbrook Stereo Amplifier Series III (3)

The Ravensbrook Stereo Amplifier Series 3 builds upon the success of its predecessors, the Series 1 and 2 amplifiers, offering several key improvements and new features:

Power and Connectivity

• Increased Output: Uprated to 20 Watts per channel
• AC Outlet: New provision of an AC outlet facility

Input and Output Options

• Multiple Inputs: Disc, radio, and tape inputs provided
• Versatile Disc Input: Four-disc sensitivities to accommodate a wide range of high-quality pickup cartridges, including those with very low output
• Tape Connectivity: DIN socket for tape replay and record, duplicated at the rear of the chassis via a second DIN socket
• Tape Monitoring: Possible with tape recorders having separate replay heads

Advanced Controls

• Volume Control: Close tolerance ganged volume control matched to 1 dB
• Tone Controls: Wide-range bass and treble controls using a modified Baxendall circuit
• Balance: Vernier balance control for precise stereo imaging
• Filters: Switched high pass filter and a variable "slope" low pass filter

Transistor technology

• the amplifier uses driver transformers, which are quadrifilar wound, similar to those used in the Ravensbourne amp
• Silicon transistors are used throughout.

The Ravensbrook Series 3 represents a significant evolution in Rogers' amplifier lineup, offering improved power output, expanded connectivity options, and refined control features compared to its predecessors.

See Forum articles on the use of Rogers' Quadrifilar transformers;

• Winding Technique
• Circuit Arrangements 

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)