SMPS for Valve amplifier

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btbass

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Has anyone made a switched mode power supply to power a ~50 Watt valve amp?
Would need about 400 volts output at a couple of hundred milliamps.

There was a silicon chip article on modifying a pc power supply for valve amps, but I can't find it.

Peavey have just released a 300 Watt Bass amplifier with a SMPS. This brings the weight down to 37lb.
 

SMPS are manufactured with different output voltage levels, also e.g. 400V.

The best way to modify an existing low voltage output SMPS design is by rewinding the transformer secondary, add a suitable rectifier and capacitor and change the feedback divider. If you want to keep the original transformer, you would need a cascade rectifier with a rather large multiply factor.
 

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