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I have a Peavey Cs 400 amp that keeps blowing the 4amp fuse as soon as I turn it on any ideas

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Fuses blow when there's an overload. This is usually caused by a transistor or IC that has shorted. You should look to the main amp as the most likely cause. If the main amp has transistors, then a test with an ohmmeter will show the faulty part. Connecting across the terminals will show the same as when you touch the test probes together. If you don't see a hole in the part first!

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

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SOURCE: peavey classic 50/50 keeps blowing fuses.


I have a classic 50/50 as well and re-tubed it with JJ el84s, vintage teslas and mullard 12at7s. As long as you replaced it with EL84s, I can't imagine that the output would be increased enough to damage the OT. When I got my 6505 Combo, one of the 6L6s was bad, and it kept blowing fuses and howling like a banshee. I would think that an OT problem would result in a significant loss of output...or none at all. I've gotten DOA tubes from a few places. I would suggest swapping each tube out 1 by 1, until you find it...if that is indeed the problem...before you pay the cash to have it worked on.

Posted on Oct 29, 2007

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SOURCE: channel A keeps switching on then off again when

Over heating from dust. (thermal blanket) Remove top and blow out. Also, observe proper output impedance matching.

Posted on Jun 13, 2009

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There are many variants of this amp depending upon its age. The fuse will be a ceramic one that should be solid white and be around 10A or more. This will be about 1-1/4" long and located inside the amp. Remove the top cover for access. It will be in a fuse holder. Please make sure that the unit is unplugged before opening.


Posted on Jul 05, 2009

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SOURCE: why does my carver receiver keep blowing the 4 amp

check speaker wires for shorts. verify correct speaker impedance (if amp if for 8 ohms, don't use 2 ohm speakers. Make sure not overheating issues with junk on top of amp.

Posted on Dec 29, 2009

  • 1 Answer


My cs400 puts out at about 1/10 volume on both channels. Best I can tell with my Huntron is that all transistors, diodes and caps are good. All op amps tested good. Plus and minus 58 vdc and 16vdc on zener board seems fine. The problems is common to both channels.

Posted on May 28, 2010

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You could also use speakers rated less than 400 RMS provided you dont crank the volume knobs all the way up.
I think the CS400 is 200 Watts RMS per channel into 8 ohms
400 watts bridged

Here's the manual. You'll need acrobat to open it.

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Some of the outputs transistors is bad hence causing a bridge in circuit,thats why the fuse is blowing.Check all the outputs transistors on both channels,rectifiers and zena diodes these are the possible causes of circuit bridge when they are faulty.The fan works on AC thats why it is not affected even when the fuse is blown.Please if you have anymore challenge please send me a mail on

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