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Marshall Valvestate 15 Problem

Posted: 17 Sep 2017, 23:14
by lakesidepark
Hello guys recently I bought a used Marshall VS15 (8015), but sometimes the sound fails, and I don't no how it happens. I'm searching for a schematic or a service manual from this amplifier.


Please help me.

Thanks

Re: Marshall Valvestate 15 Problem

Posted: 18 Sep 2017, 10:58
by karul
http://schems.com/bmampscom/marshall/

Valvestate 20 schematic is available. Take a look at it. They should be similar.

What's inside V15 ? LM1875 or TDA2030 ?

Re: Marshall Valvestate 15 Problem

Posted: 18 Sep 2017, 14:00
by lakesidepark
The valvestate 15 have 2 gain, linked each other, and uses LM1875, but my problem is between , before the tonestack.

Re: Marshall Valvestate 15 Problem

Posted: 18 Sep 2017, 14:27
by EddieTavares
Can you talk about that fail? Does it mute the amp?

Re: Marshall Valvestate 15 Problem

Posted: 18 Sep 2017, 18:47
by lakesidepark
Sometimes when i'm playing appears a hum and the sounds become saturated, and the bass control has no action when I turn, and the mid pot work like bass pot on/off.

Re: Marshall Valvestate 15 Problem

Posted: 12 Dec 2019, 10:48
by HIGEBOBO

Re: Marshall Valvestate 15 Problem

Posted: 12 Dec 2019, 10:52
by HIGEBOBO