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Intermittent signal to amp in TV8100. When it sounds full, it sounds great but most of the time no signal or very very weak.

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  • Marshall Master
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Often this is a broken inout jack. Wiggle and look for intermittent operation.

Also operate all controls and see if any are noisy.

Posted on Sep 06, 2009

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Not functioning..


I would check it with a different instrument cable AND bass guitar. If you end up with the same results, it's a thermal issue with the amp and will require factory authorized repair. The amp heats up and the intermittent component starts failing....more heat, more failure. It's not an easy fix and your Behringer repair shop will have their work cut out for them with this repair.

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By ading in the harmony signals you are combining 3 signals so gain is probably going to be high you will have to reduce it before it goes to the amp or turn down the input gain of the amp.

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Also the volume will probably be lower going into the line level PA input... If the amp is shutting down for thermal reasons, driving it less might not get to the point of shutdown. The schematic shows a temp sensor that reduces and shuts down the amp if the heatsinks get to hot. Possibly you are driving the amp harder than it is intended, If it is as loud (I doubt it) driving the PA input, then I would expect it to shutdown, but you would probably have to drive it harder than your guitar because guitar levels are well below line level. The amp claims 65 watts... don't believe everything you read in spec sheets... You should be able to generate 100 Db of sound with it... The more distortion you use will drive the amp harder and heat the heatsinks faster.

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1 Answer

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It sounds like you have cable in the wrong ports. Make sure your cabling goes in to out on all ports. Also make sure no cable are bent or heavy equipment on top of it. If your getting sound but sounds like muted sound its either cable in the wrong place bad cable or amp setting is to low.

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All 3 cannels on my kb 100 working intermitently ? then not at all. can anyone help......cheers.......


Sometimes the bypass switch contacts on the effects jacks get oxidized and fail to connect the preamp to the power amp... test this by plugging another guitar cable between the two effects (send and return) and see if the amp is solid with the cable in place, These jacks in the music equipment are really not very durable. If in failed mode you can plug a cable into the effects RETURN and touch the tip and NOT get a it of hum, there is a problem in the power amp portion. Conversely if that works, then plug a set of headphones into the effects SEND and see if you can hear a signal from the inout coming through... Itwill only be on one side of the headphones (left) as it is a monaural jack. If you can't hear a weak signal here, the problem is in the preamp... LIKELY a cracked board or bad solder around one of the volume or master gain controls... a very common problem and often is intermittent... you might try wiggling the volume/gain pots sideways a tiny bit... if it pops on, remove the amp and look for bad solder on the control leads where they attach to the board.

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The question is whether or not you get any sound from the horn when in full-range. If so, then either the input jack for the horn is defective, or you are not passing the signal. A quick check would be to send the full-range signal (at low volume) to the high-freq input. You should hear the horn work. If not then the connector is defective on the crossover board.

If you get no sound from the horn in any configuration, then the coil is blown for the horn. This can be replaced. It is usually a 22a or 22ti diaphram

Let us know what you find.

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Hi my orange tiny terror combo is great, but I am having problems with it when it starts up, it seems to be very weak but after a while when it warms up it jumps dramaticaly in volume, it could be just the...


Tube problem? NO !!! not likely... but look for one of the heaters to not be on before it corrects itself. Usually vibration would cause a fast temprary cure if it is a bad tube or circuit board connection.

The problem is LIKELY a bad solder joint somewhere. Some component could also be bad, but first look for bad solder joint.

Open up and get in failure mode and start putting pressure on things to isolate where the intermittent is located.

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2 Answers

Marshall DSL 100 - volume fades away and gradually comes back on


IF this is a vacuum tube unit, these symptoms are that of a tube that the heater is intermittent, that is it cools off due to a break and then liights again.

Open the back and observe the heaters in the tubes. DO NOT be fooled by some that have TWO heaters in them. (use a mirror if necessary) A single one that comes and goes can cause the problem and the voiration can make it come and go. This behavior in a tube is NOT somthing readily spotted in a tube checker. The delay in fading and coming back would be the delay in warm up following a heater going out and cooling.

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