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ORANGE AMPS(AC30THC)

I HAVE THIS AMP HEAD...WITH IT...2X12 SPEAKER CABINET....I HAVE HAD THIS SETUP FOR 3 YEARS....AND HAD TO HAVE IT IN FOR REPAIRS 5 TIMES...THREE WITH A BAD TUBES..AND BLOWN FUSES....AND THE OTHER TWO REPAIRS WERE ADJUSTMENTS ON BIAS....

HAS ANYONE HAVE THOUGHTS ON WHY TUBES...AND FUSES BLOW...THE TUBES AT MOST WERE 1 YEAR OLD...ANY THOUGHTS ON HOW TO KEEP THESE THINGS FROM FRYING...