Mesa Boogie Road King

kendog · 10th January 2009, 03:59 PM

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?

Kramerguy · 11th January 2009, 01:54 AM

You need to see a very experienced Amp tech who has a variac. First thing to diagnose is transformer failure.

AmpKiller66 · 11th January 2009, 02:11 AM

Sounds like power transformer failure

kendog · 11th January 2009, 03:23 PM

I kinda figured that is what it is , just hoping for something simpler.
Thanks

Nigel Goodwin · 11th January 2009, 09:04 PM

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.

nhuwar · 12th January 2009, 03:19 PM

I agree an ohm meter would be the right tool for the job here.
Could be a filter cap too.

Nick

10th January 2009, 03:59 PM	#1
kendog diyAudio Member Join Date: Jan 2009	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?

11th January 2009, 02:11 AM	#3
AmpKiller66 diyAudio Member Join Date: Mar 2007 Location: Middle of Nowhere	Sounds like power transformer failure __________________ In the immortal words of Socrates, "I drank what!?"

11th January 2009, 09:04 PM	#5
Nigel Goodwin diyAudio Member Join Date: Jul 2005 Location: North Derbyshire	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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11th January 2009, 01:54 AM	#2
Kramerguy diyAudio Member Join Date: Dec 2008	You need to see a very experienced Amp tech who has a variac. First thing to diagnose is transformer failure.

11th January 2009, 03:23 PM	#4
kendog diyAudio Member Join Date: Jan 2009	I kinda figured that is what it is , just hoping for something simpler. Thanks

12th January 2009, 03:19 PM	#6
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	I agree an ohm meter would be the right tool for the job here. Could be a filter cap too. Nick

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