AMPEG SVT wierd fuse blowing!

Matt Syson · 31st March 2007, 08:49 PM

Hi
I am loooking at an SVT which for 99% of the time works perfectly (except the graphic EQ section when 'in' adds a fair amount of hum).
The problem is that it blows the mains fuse (correct anti-surge type) every now and again.
I have had this thing on the bench running with a CD on the input for 3 days loud enough to be clipping (into a resistor load!!) and it runs fine. Take it on a gig and it will take a fuse out after 2 songs playing 'moderately'.
At clipping it kicks out about 320 Watts into 2 ohms and is consuming about 900 Watts of mains but I can't get anywhere near taking out the mains fuse 'on the bench'.
Anyone with any practical ideas?
Matt S

FFTT · 1st April 2007, 12:04 AM

It sounds like the added vibration of live performance is triggering some sort
of loose connection.

Mine had a problem blowing some sort of diode and then later the transformer went.

Never once blew a fuse in all that time.

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31st March 2007, 08:49 PM	#1
Matt Syson Lives for gear Join Date: Sep 2004 Location: UK Posts: 1,437	AMPEG SVT wierd fuse blowing! Hi I am loooking at an SVT which for 99% of the time works perfectly (except the graphic EQ section when 'in' adds a fair amount of hum). The problem is that it blows the mains fuse (correct anti-surge type) every now and again. I have had this thing on the bench running with a CD on the input for 3 days loud enough to be clipping (into a resistor load!!) and it runs fine. Take it on a gig and it will take a fuse out after 2 songs playing 'moderately'. At clipping it kicks out about 320 Watts into 2 ohms and is consuming about 900 Watts of mains but I can't get anywhere near taking out the mains fuse 'on the bench'. Anyone with any practical ideas? Matt S __________________ Matt S www.mseaudio.co.uk

1st April 2007, 12:04 AM	#2
FFTT Lives for gear Join Date: Dec 2005 Location: A stoned throw from ground zero Posts: 2,932	It sounds like the added vibration of live performance is triggering some sort of loose connection. Mine had a problem blowing some sort of diode and then later the transformer went. Never once blew a fuse in all that time. __________________ Don't look at me in that tone of voice

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