Question about VOX Amplification Vox VT30 Valvetronix Tube Amp Combo for Guitar

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I have a vox valvetronic 50, which keeps blowing fuses as soon as it is switched on and leaves a burning smell. any ideas?

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One or more parts in the power supply section is defective. I would recommend taking/sending the unit to a repair depot.

Posted on Oct 20, 2013

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Is it possible to lower the VOX VT50 transfo outgoing voltage?


bulbs have tolerance, that means it can work with + or - 6.3v just use the 7.6v which a diffrence of 1.is ok for it to work.

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1 Answer

Vox vt40+


that is because it is two different output channels. eventually you will blow the speaker or your amp. It wasn't designed to handle the impedance of an external speaker through the stereo
headphone jack. Are you sure that your speaker is hooked up or plugged in?

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Bm5a blows fuse when turned on


Blowing a fuse means that it has a dead short. The fuse does its job by protecting the other components while the circuit fails. Something is definitely burned out inside.

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1 Answer

M-Audio AV20 smells like burnt


Yes, it is possible to burn an IC and not the fuse, because of Safety standards, the fuse has the function to avoid a possible fire, but it should deliver all the power needed by the circuit it is protecting, and that amount of power can burn, in this case, the IC.
From my technical point of view, there should not be a problem to connect the speaker to 110 V instead of 220 V, all that might happen is to have less power available at output, I have no idea about the reason of the burnt IC, but, as we all know, they (the IC's), don't need a reason to burn themselves whenever they decide to.
So, the next step, will be to replace the burnt IC, and that is not a simple task, you need a SMD station and some experience in doing such jobs.
Good luck and best wishes.

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1 Answer

4 200b chauvet lights stopped working ,blowing the internal fuses when plugged in.


It is never a good idea using LED lights with Triac switches, which I assume if what will be in your remote control unit. Good old fashioned relay units are fine but there is often a problem with triac and thyristor controls as they do not expect the type of load that LED lights present and they often do not switch on properly causing all sorts of issues including burning out (invisibly) interal circuitry.

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I was playing then all the sudden it sounded like it shorted out. The power is still on and the tubes fire up but the "STANDBUY" switch isn't lighting up when in on position. Please help.


The speaker is blown. Did it smell a little funny when this happened. Sometimes they get a faint burning smell when they blow. Some Peavey amps especially older ones are known for letting DC current slip through to the speaker and blows it immediately. Most of the rest of the amp deals with that pretty well so I'm not quite sure what going on with the standby switch. Probably just a blown bulb.

Jul 16, 2011 | Peavey 6505+ 112 Combo Amp Combo

1 Answer

No Power at all. Fuse blown-Burn smell from fan area.


You did a lot of damage, and replacing the fuse and trying it has caused much more.

There will be about seven blown parts on the amp and a dozen on the power supply. To give you an idea of the extent, the WHOLESALE parts cost is roughly $50, including the main power supply switchers IGBT's which cost nearly $20 for the pair by themselves.

I have repaired several of these and the larger cousin the PMP5000. It is a lot of skilled work to repair these.

The cause is a marginal insulation between layers of the multi-layer amplifier board. Usually the rearmost amp arcs between the layers. This fries three big switching transistors followed sometimes by a metering resistor and two small surface mounted transistors. A zener diode often goes. The cancer and burned area has to be ground out with a dental drill and new wire replaces the blown circuit traces.

If you are under warranty, take the unit for replacement.

The thing that can arc the amp is if speaker leads are marginal or get pulled out while under power. Excessive volume, especially pulses at high level can break down the insulaton causing the arc and failure. The black smoke is likely from the metering resistor.

Jul 30, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

Found fuse burned-out. Have not replaced fused but does burn-smell can be from the fuse and non others ?


Typically fuses are made from a specific material which will burn in half just above the rated current. The material is enclosed in either a glass tube, ceramic tube or epoxy tube. I have seen many fuses blow and blown and never smelled anything. They are designed to go quickly and not give off anything. More likely you are smelling the burned component. Could be a bad electrolytic capacitor or more likely a bad output transistor. Check all the capacitors (the ones that I am talking about look like little cans) to see if any are bulging or have exploded or have liquid ozing out of them. If nothing is visible I would check to see if any output transistors are shorted with a DMM. It will be one or the other. If you need more specifics on how to do the testing or any questions let me know.

hardrocko

Thank you for using FixYa.

Feb 12, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

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