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PostPosted: Mon, Jan 08, 2018 3:29am 
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The main fuse in my '02 VH4 keeps blowing :(

I've pulled all the power tubes but the fuse still keeps blowing when amp turns on, the tube fuses looks fine so I guess it's not tube related...?

One of the resistor under a power tube seems like it's melted, could this cause the man fuse to blow?

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RESISTOR1.jpg
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RESISTOR1.1.jpg [ 54.05 KiB | Viewed 202 times ]


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PostPosted: Mon, Jan 08, 2018 8:52am 
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Diezel Amplification
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service@diezelamplification.com


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PostPosted: Mon, Jan 08, 2018 9:29am 
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Vigier Arpege wrote:
The main fuse in my '02 VH4 keeps blowing :(

I've pulled all the power tubes but the fuse still keeps blowing when amp turns on, the tube fuses looks fine so I guess it's not tube related...?

One of the resistor under a power tube seems like it's melted, could this cause the man fuse to blow?

Attachment:
RESISTOR1.jpg


Attachment:
RESISTOR1.1.jpg


That looks like a Ceramic wirewound resistor, they can burn out, but they don't melt (well at least that ceramic case does not) . That looks like some glue they used to hold the ribbon cable in place.


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PostPosted: Mon, Jan 08, 2018 2:17pm 
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Journeyman NOOB
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Pull the pre tubes too.

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PostPosted: Tue, Jan 09, 2018 7:04am 
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Peter Diezel wrote:
service@diezelamplification.com

Thanks Peter, I'll do!


rickenbacker198 wrote:
Pull the pre tubes too.

The pre tubes light up when in standby, will they light up if broken?


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PostPosted: Tue, Jan 09, 2018 9:14am 
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Vigier Arpege wrote:
Peter Diezel wrote:
service@diezelamplification.com

Thanks Peter, I'll do!


rickenbacker198 wrote:
Pull the pre tubes too.

The pre tubes light up when in standby, will they light up if broken?



Any tube can still light up after they fail. Actually most do. The light you see is the heater which is a totally separate element of the tube.

You could have a shorted preamp tube, this could cause a fuse to pop. You could have a bad capacitor, or a shorted power transformer, etc.


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PostPosted: Tue, Jan 09, 2018 9:34am 
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Thanks!
I've pulled the preamp tubes but the fuse still pops, so its something else. --> Diezel support :)


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