Carver Amplifier M-400A Repair

Magnetic Hysteresis Triac phase controlled primary in the power tranny. Carver M-400A amplifier. Interesting repair job.

The Power Supply Schematic… opto coupled level proportional to power output driving Diac-Triac combo to phase control the tranny primary as a load.  Power and heat saving for this 100Wrms  per channel amp.

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Sadly in TAFE electronics courses, power control is not often taught but it’s one of the few remaining domains for repair work.

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Not as heavy as it looks, as the transformer is smaller than would be expected.

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Love that name.. ‘Magnetic Field Power Amplifier’

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All BJT in output and now with eBay fakes which tend to short Collector to Base the front end of amp channels gets a lot of damage unnecessarily.  Original trannys short C to emitter and the input section remains unaffected.  Just too many fake components in the market now.


May 2017
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