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Champion SPR-910 Spark plug radio
Champion SPR-910
AC operated Spark plug radio. 8 transistors, 1 diode, 1 thermistor and 1 silicon diode. Output 250 mw.
RIC Japan. R I C SPR-B403-110-B PAT.

Champion SPR-910 Spark plug radio
Champion SPR-910 Spark plug radio PC board
Here's what it looked like while I was working on it. It works very well now.
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