Help!
I bought this amp cheap and have been playing it for three years. It would hardly run when I got it and I replaced all the pots. Later have replaced ic line chips #3,#5,#7.(a you tuber suggested this but did not help)
It has a lot of fizz and as you turn it up on volume and gain it gets worse. I use it at home to practice but would be no good on a gig.OD 2 is real bad and not even usable. It seems that pedals in front help to quiet it down a bit. Pull the instrument cable out and it sounds like a blizzard is going on.
Also if you run the guitar into the effects loop instead of the input jack and run the blend at full effect setting, it is as quiet as a mouse. So the problem is pre effect loop which is 95 % of the amp. I am not a tech just a little handy. Thanks for viewing.
http://www.drtube.com/schematics/marshall/pc0689.pdf
I bought this amp cheap and have been playing it for three years. It would hardly run when I got it and I replaced all the pots. Later have replaced ic line chips #3,#5,#7.(a you tuber suggested this but did not help)
It has a lot of fizz and as you turn it up on volume and gain it gets worse. I use it at home to practice but would be no good on a gig.OD 2 is real bad and not even usable. It seems that pedals in front help to quiet it down a bit. Pull the instrument cable out and it sounds like a blizzard is going on.
Also if you run the guitar into the effects loop instead of the input jack and run the blend at full effect setting, it is as quiet as a mouse. So the problem is pre effect loop which is 95 % of the amp. I am not a tech just a little handy. Thanks for viewing.
http://www.drtube.com/schematics/marshall/pc0689.pdf