Question about Fender Hot Rod Deluxe Guitar Combo Amplifier

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Amp lost power and smelled like something was burning

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You'll have to remove the amplifier section from the speaker cabinet and look inside the chassis.
Check the power transformer, the output transformer and the rectifier, see if any of these shows signs of overheating.

Posted on Jul 24, 2009


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I have a Mackie 406m powered mixer. I was in a club with less than adequate power. My mixer got very hot and started smelling. Now when I turn it on, over 6 months later, it still smells and it has a loud...

More in likely a voltage drop in the club, and the mixers power transformer was fighting for power, so it's brunt or burning up, also there are capacitors that filter the AC transformer hum, they Probably need to be replaced, this can be fixed tho, parts and labor might not be cheap...

Mar 05, 2015 | Mackie Music

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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?

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

Oct 20, 2013 | VOX Amplification Vox VT30 Valvetronix...

1 Answer

Why is my amplifier losing power

If it is a tube amp, the tube finals may not be producing enough free electrons from the heater and should be replaced.

The same can be true of the preamp tubes as well, but they also tend to become more noisy.

If it is a solid state amp, Or you just retubed a tube amp Check to see if the filter caps are begining to fail. These will usually reveal themselves as more 50 or 60 Hertz hum or harmonic thereof depending on the mains frequency and which cap is failing. While not highly likely, it is also possible the power transformer is failing- but it will produce a burned smell if it does.

Apr 05, 2012 | Music

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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

Last weekend while I was playing, I smelled that smell. After I turned my 800RB bass amp off I saw smoke coming out of the foot switch input so I hooked up my spare amp. When I took the amp apart I found...

They are NOT called motherboards, just circuit boards.

Sometimes the board can be restored by carving out the black and re-insulating it and repairing the cause and bad components.

Likely the power transistors have shorted that are associated with that side and burned compnents.

Many shops will only replace the whole board rather than do the labor to restore the board... Yes, either way it will be expensive to repair.

Causes of these failures can be overdriving the amp. bad speakers and or cables. Loose speaker connectors that vibrate can lead to this.

Another problem can be if SUPERSONIC (can't hear it) feedback is occuring at high frequencies that overloads the amp.

Aug 08, 2010 | GallienKrueger Gallien Krueger 800rb

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

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Blown fuse and replaced it and burned the amp

BIG problem! You should NOT have replaced the fuse as additional damage has been done. I repaired a PMP5000 and I can tell you likely what you will find: The smoke and smell came from two power resistors that are part of the soft start circuit that now are toast. You will likely find several components in the main portion of the power supply that are toast. These will include transistors, resistors, diodes, and probably the small 8 pin switching regulator chip. There is a small power supply that comes on first which enables a relay that shorts out those soft start resistors AFTER the power amplifier BALANCES and normalizes.
The unit I repaired had severe damage due to arc-over at one power amp section. Three power transistors were destroyed there and board traces and charring had to be handled in that section.
The repaired unit had to be brought up with a light bulb in series with the line power cord to prevent further damage until all bad parts were discovered and repaired. You will need to take the unit to a shop that is expperienced with the product. The repair cost MAY be pretty high.

Mar 08, 2009 | Behringer Pmp3000 16 Channel Audio Mixer

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