Marshall Valvestate 15 Problem

Tube or solid-state, this section goes to eleven!
Post Reply
User avatar
lakesidepark
Information
Posts: 10
Joined: 25 Aug 2014, 14:48
Been thanked: 1 time

Post 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

User avatar
karul
Cap Cooler
Information
Posts: 504
Joined: 02 Jan 2011, 20:28
Has thanked: 597 times
Been thanked: 259 times

Post 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 ?

User avatar
lakesidepark
Information
Posts: 10
Joined: 25 Aug 2014, 14:48
Been thanked: 1 time

Post by lakesidepark »

The valvestate 15 have 2 gain, linked each other, and uses LM1875, but my problem is between , before the tonestack.

User avatar
EddieTavares
Breadboard Brother
Information
Posts: 126
Joined: 12 Jan 2010, 13:43
my favorite amplifier: marshall
Has thanked: 9 times
Been thanked: 26 times

Post by EddieTavares »

Can you talk about that fail? Does it mute the amp?

User avatar
lakesidepark
Information
Posts: 10
Joined: 25 Aug 2014, 14:48
Been thanked: 1 time

Post 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.

User avatar
HIGEBOBO
Information
Posts: 2
Joined: 01 Oct 2013, 14:49

Post by HIGEBOBO »


User avatar
HIGEBOBO
Information
Posts: 2
Joined: 01 Oct 2013, 14:49

Post by HIGEBOBO »


Post Reply