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RE: Dynaco 400 amplifier problems,

I am also assuming that the B+/B- fuses are not blown. Most Stereo 400s I've seen were equipped with ceramic fuses that have to be checked with an ohmmeter.

If they are already blown, you probably already have shorted output transistors and very likely, damage on the driver boards. I'd power up such an amp through a VariAC but you're going to power it up through a light bulb to absorb excess current, as a precaution.

Good luck!


GP49

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