Marshall 8080-Channel select button problem - diyAudio
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Old 9th November 2010, 10:21 AM   #1
diyAudio Member
Join Date: Nov 2010
Default Marshall 8080-Channel select button problem

Hi there,

I have a Marshall Valvestate 80v - Model 8080.
The channel select button from Normal channel To Boost channel is sometimes jumping from one to another, it usualy happens when i play some time (Maybe heat problem ?). But it usualy happens from Clean to Boost as long as i can remember.

Here is an image of the amp and this button.
Click the image to open in full size.

What can be the problem ?


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Old 10th November 2010, 02:48 AM   #2
Enzo is offline Enzo  United States
diyAudio Member
Join Date: Sep 2004
Location: Lansing, Michigan
The switch contacts can be dirty, the solder under the switch can be cracked, the switch can be mechanically failing, there can be a problem with the power supply to that circuit. TR1, TR2 could be going leaky.
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Old 10th November 2010, 10:10 AM   #3
diyAudio Member
Join Date: Nov 2010
I gave the amp to a technician and he said that every thing is O.K. with this switch, but i don't think he is a good technician.
I already paid him and i have warranty so i'm hoping he know how to repair it.
I asked the question in order to know better and if it's necessary i'll ask him if he checked this options.

I already have regrets for not going to a well known technician.

Thanks for helping

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