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Old 9th Jul 2020, 12:49 pm   #10
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
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Default Re: RS Stereo Amplifier PCB

I vaguely remember something about those ICs originally being designed by Plessey for use as servo-drivers or Radar scanning or something where the output current slewed relatively linearly and slowly rather than being distinctly-peaky like an audio signal: in such applications they worked just fine. BUT the little wires linking the semiconductor 'slab' to the leadout-pins were rather thin, and when they were subjected to instantaneous high-power transients on a regular basis the effect of repeated thermal-cycling resulted in them embrittling and going open-circuit.

[I have a vision of a test-suite full of amplifiers all playing Ravel's Bolero into dummy-loads....]
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