Marshall Contour Control

Michael Matyas

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Could someone explain to me how the Marshall Contour Control works? I have an older Valvestate 30 and it sounds almost the same to me no matter where it is set.
 

ARandall

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Maybe its not operational any more, or has been negated by eq controls already in operation. Its a mids control anyhow......generally a scoop.
 

freefrog

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Contour controls on Valvestate's are extremely efficient IME. Almost too much. So, if this control has no effect in a given amp, there's probably a problem in the circuit.
 

dodona

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Could someone explain to me how the Marshall Contour Control works? I have an older Valvestate 30 and it sounds almost the same to me no matter where it is set.
then its broken.
Basically its a early version of the ISF control of modern blackstar amps.

 
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Michael Matyas

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Thanks to all you guys. I think I'll just use the clean channel with a pedal in front of it. That sounds pretty good to me.
 

wildschwein

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The solder on the Contour pot is probably cracked. VS amps often have issues with this because the pots are soldered directly to the the board and if the pot washers get loose the pots can flex at the mounting point. Take it it to a tech and they can check this.
 


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