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Marshall Valvestate 8100 Head volume too quiet in gain channel. Everything else works fine ie clean channel and leads, socket, guitar. 14 yrs old, previously worked fine (within matter of weeks)

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  • wunjo7 Oct 22, 2008

    Thanks Dan

    I cant seem to unscrew the cover because the screws keep rotating when turned anticlockwise. I'm assuming its the metal cage on the left at the back - any ideas?




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How to change tube on Marshall Valvestate 8080

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I believe that your model uses a 12AX7 tube for the pre-amp section. The tube is bad and needs to be replaced. Start there.


Posted on Oct 21, 2008


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I have a Marshall ma100h that when boost is engaged hums incredibly loud. I've tried everything I can think of. The only thing to fix it is to turn the gain to zero.

I assume you've also made sure you're using a well sheilded intrument cable? If you're using a single coil pickup guitar like a Strat, you need to be sure you get the pickup cavity shielded. Past that it may be a bad tube in that gain stage.

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The guitar is not amplifying

faulty lead? when the lead is plugged in turn the amp distortion on (may be called 'gain') and when you tap the end that goes into the guitar with your finger you should hear a buzz. try another lead if not, and if it still doesn't work make sure that volume is up on the amp and the guitar. there may also be a knob in the back of the amp, turn that up too (but not all the way or when you do get it working you'll blow the speakers out).

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Every time i turn on their is a loud high pitch squeel that occurs on my Marshall VS232 amp. My volume is all the way down, and the gain channel isnt on either. What is the problem?

If this happens when guitar cable is disconnected, take unit in for repair. This should be easy to troubleshoot. Hint: demonstrate the problem in the shop. Things have a way of fixing themselves and then lots of time is wasted trying to recreate the problem.

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I run a pod HD 500 into the amp and It breaks up, like there is a blown speaker sometimes.

The Marshall is a super clean acoustic amp.

The POD is overloading the amp.

Try the electric guitar input and keep the gain on the amp down, keep the EQ level and use the POD and the end volume to adjust the final volume.

The normal inputs is for a low output acoustic pickup - the POD is a high output electronic source.

Start with the Marshall gains low and get the clean sound good, then work on the gritty sound.

The amp is voiced for a sweet clean sound - if you want grit'n'ball change to a 50w Marshall valve head and a 4 X 12 cabinet.

Horses for courses

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the guitar lead goes to the input or channel one on the amp head .. then look at the back there should be a socket for speaker or output a short bridge cable normal guitar cable will do to the input at the back of the cabinet speaker

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3 Answers

Marshall mg100hdfx loud fuzz and distortion and no guitar sound

Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.

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There are 2 channels, Which means there are 2 sets of knobs ... One for clean and one for crunch. Start out with a low master volume and set up the crunch, Then the clen and switch between the 2 and make adjustments until they match volume wise ... Then turn the master up.

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