...this tantalum bead (apparently a cross between a passive two-terminal electrical component used to store energy electrostatically in an electric field, and a firework) just exploded for no apparent reason. There were real flames! Looked like a coffee bean - but smelt much worse! Shorted out as is the fashion for these things and annoyingly took with it the output transistor on the negative rail of the main power supply. All fixed now. And both capacitors replaced with electrolytics.
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