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PLAYMASTER 143--Stereo Amplifier 2 x 12. 5 watts :
Specification
Basic Plan of Amplifier
Pre-Amp Tone Control Circuit
Power Module Circuit
Heatsink Details
Quadraphonic Simulator Circuit
Detailed Layout Diagram
Component List
Transistor Equivalents
PLAYMASTER 145--8 Input Stereo / Mono Mixer :
Specification
Mixer Board Circuit
Power Supply Circuit
Basic Plan of Mixer
Detailed Layout Diagram
Frequency Response Curves
Mute Board Circuit
Universal Pre-Amplifier Circuit
Ceramic Cartridge Pre-Amplifier Circuit
Component List
PLAYMASTER 140--Quadraphonic Amplifier 4 x 14 watts:
Specification
Basic Plan of Amplifier
Frequency Response Curves
Detailed Layout Diagram
Hi-Lo Filter Circuit & Details
Power Module Mount Details
Wiring Loom Layout
Power Module Circuit
SQ Decoder Circuit
Pre-Amp Tone Control Circuit
Stereo 24 Decoder Circuit
Phase Change Module Circuit
Case Construction Details
Component List
Notes on Alternative Transistors
N. B.
Because these projects are fairly complex, we would not recommend them to the inexperienced constructor. The dimensions and mounting details given in this guide are those that applied to the prototype and should only be used as a guide, as the builder may well construct module boards, or use components of a different dimension to those used in the prototype.
Many of the modules may be constructed simply on Vero-board or an equivalent type of assembly board, alternatively it is quite possible for an experienced amateur to design and etch his own printed circuit boards.
Also see:
Mullard Circuits for Audio Amplifiers [1963]