Galien Krueger 800RB blows main fuses

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Same thing it is in any amp that blows fuses. Shorted output devices or shorted power supply rectifiers. With the amp cold, check for E-C shorts in all output transistor strings. Check the main bridge for shorted legs. That should cover 95% of the time. beyond that, try the usual suspects - Shorted filter cap, some sort of short across the power rails, some sort of short across the output, shorts acrosss the primary. And of course loose hardware - any missing screws or nuts? A loose one under a pc board can short out most anything.
 
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