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Old 10th January 2009, 03:59 PM   #1
kendog is offline kendog  United States
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Default Mesa Boogie Road King

My Mesa Boogie Road King is not turning on at all, It blew the 4amp 250v slo-blo fuse . I replaced the fuse and put two new 5u4g rectifier tubes in, one of the old ones was more than suspect, (like the base of the tube was loose) when I try to fire it up I get nothing at all now, no lights, no hums, nothing at all. Could the input transformer go that quick. I have 2 dual rects. the road king and the tremoverb, the tremoverb is 12 yrs old , I have had tubes go in it , a fuse, but it always fired right back up. The Road King is only 5 yrs old I've replaced the 2 el34's and the 46L6's and the 2 5U4G's still nothing.
Any ideas what it could be or had similar problems?
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Old 11th January 2009, 01:54 AM   #2
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You need to see a very experienced Amp tech who has a variac. First thing to diagnose is transformer failure.
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Old 11th January 2009, 02:11 AM   #3
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Location: Kansas
Sounds like power transformer failure
My band Waffle Stomp:
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Old 11th January 2009, 03:23 PM   #4
kendog is offline kendog  United States
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I kinda figured that is what it is , just hoping for something simpler.
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Old 11th January 2009, 09:04 PM   #5
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Don't quite see why you would need a variac for repairing it?, a simple multimeter on the ohms range will easily check the transformer.
Nigel Goodwin
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Old 12th January 2009, 03:19 PM   #6
nhuwar is offline nhuwar  United States
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I agree an ohm meter would be the right tool for the job here.
Could be a filter cap too.

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