Bass amp head trips power at switch on - diyAudio
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Old 23rd November 2007, 03:38 PM   #1
gazsp is offline gazsp  United Kingdom
diyAudio Member
Join Date: Aug 2007
Default Bass amp head trips power at switch on

Hi all,

My bass amp head sometimes trips the power when I first switch it on. This only happens at one venue in particular, and it really gets on the sound engineers nerves!

Just wondering if there's anyway I can modify the amp to stop it doing this. The amp in question is a Behringer BX4500H. I've read in other places on the net that other users of this amp have experienced the same problem.

Any info or suggestions would be most welcome.

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Old 23rd November 2007, 09:23 PM   #2
diyAudio Member
Join Date: Jul 2005
Location: North Derbyshire
Presumably these venues are using MCB's instead of fuses? - MCB's are really too sensitive, we had to take them out at work and refit fuse holders.

But that's obviously not a help for your problem

What you could do is fit a slow start circuit in the amp, these used to be fairly common in big amplifiers, particularly with toroidal transformers - if your is toroidal?.

Essentially you wire a high wattage wirewound resistor in series with the mains transformer primary - this then limits the input surge to the transformer - after a couple of seconds a timer circuit shorts the resistor out, using either a relay or a triac. This drastically reduces the surge when you plug it in - and should cure your problem.

Have a look here for a more detailed explaination, and suitable circuits.
Nigel Goodwin
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