PMH 1000 Fuse blowing - Bang

valvewhiz · 2nd July 2010, 06:23 PM

Hi,

I have a friend's PMH1000 that I borrowed for the second time this week, worked o.k. for two sessions then when plugged in it went with a loud bang blowing the amp fuse, the plug fuse and taking out the breaker at the venue.

On opening the amp up and doing some resistance checks on the input and outputs of the PSU I can find no shorts, and also none on the power amp + and - rails.

Any ideas anyone, (I normally repair Valve guitar amps!!)

Valvewhiz

valvewhiz · 3rd July 2010, 08:58 AM

Hi,

Further to my previous post, both switching mosfets have blown, taking at least one 0.47 ohm resistor out, what else is likely to have gone besides the mosfets?

I'm more at home with valves and hate switching power supplies

Thank you

Valvewhiz

2nd July 2010, 06:23 PM	#1
valvewhiz diyAudio Member Join Date: Jul 2010	PMH 1000 Fuse blowing - Bang Hi, I have a friend's PMH1000 that I borrowed for the second time this week, worked o.k. for two sessions then when plugged in it went with a loud bang blowing the amp fuse, the plug fuse and taking out the breaker at the venue. On opening the amp up and doing some resistance checks on the input and outputs of the PSU I can find no shorts, and also none on the power amp + and - rails. Any ideas anyone, (I normally repair Valve guitar amps!!) Valvewhiz

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3rd July 2010, 08:58 AM	#2
valvewhiz diyAudio Member Join Date: Jul 2010	Hi, Further to my previous post, both switching mosfets have blown, taking at least one 0.47 ohm resistor out, what else is likely to have gone besides the mosfets? I'm more at home with valves and hate switching power supplies Thank you Valvewhiz

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