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Fuse size in marshall valvestate vs100

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Posted on Jan 02, 2017

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SOURCE: marshall valvestate 8080 1. when i turn the buttons they make a cracking sound 2.when i play on it the sound becomes very quiet

As an electronics tech for 40 years I have spent half of those years reparing the damage done to electronic equipment by WD40. It is a great product when used in the correct situation. When it comes to cleaning controls in amplifiers etc the correct procedure is to apply a contact cleaner to flush out any dirt then apply a contact lubricant. WD40 contains minute graphite particles as well as corrosive chemicals. Between the two they swiftly render the controls to the bin.
WD40 great for unlocking rusty screws etc but never use it in electronic gear.

Posted on Jun 01, 2010

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SOURCE: its a marshal 8080 valvestate 80 v and it buzzes

Buzzing could be normal for this amp, especially if you have the gain cranked way up (or the volume way up) see if the buzz goes away when you turn the gain/volume down. If not, there is a problem that needs to be properly diagnosed by the amp tech at your local music store. The crackling is also unfortunately rather normal for an amp that's a little older. Oxidation builds up inside the knobs and makes that noise as you turn them. If it only happens when you change settings I wouldn't worry about it, but if it gets bad, a tech guy can clean it out for you.

Posted on Mar 05, 2011

  • 1212 Answers

SOURCE: marshall valvestate 2000 avt no effects

If just no effects, look for a loose ribbon wire. Check footswitch and make sure the plug and jack are fully mated.

It is possible you have a defective 4558 IC, about the only way to locate the problem IC or transistor quickly is to "buzz test" the circuit. You may need to have an audio input of some sort pugged in as well to get the effects to respond. Expose the bottom of the chassis, and with a screwdriver begining at the output, work your way back through the stages/ICs until you lose the signal. Since you seem to indicate it is at the effects, begiin where they end.

Also make sure the solder connections are sound.

Pin 3 and pin 5 are the positive/noninverting inputs to the 4558 series of IC.

Posted on Jan 27, 2012

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1 Answer

Marshall repair valvestate 8080

if it is C1 then it's the input capacitor from the instrument jack input, it's value is 10nF, as to it's type it could be 1 of three and I don't know without seeing it although all would work, from cheapest to most expensive, they are :- mylar, polyester or polyester film.

Good luck.

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4 Answers

Marshall valvestate 8080 1. when i turn the buttons they make a cracking sound 2.when i play on it the sound becomes very quiet

When turning the knobs you might get a crackling noise if the amp is old, The knobs get worn. Either you can replace them or repair them with a tiny squirt of WD40. Check youtube videos for help.

As for the fading sound, That would be your valves ... They need to be replaced ... I suggest taking it to a repair dhop for that because they need to be matched.

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