Troubleshooting Problems

MP1 Classic Clean Issue

Started by AndiK

Replies: 7
Views: 6,192

May 01, 2019, 04:06:36 AM
by MarshallJMP

4ohm Resistor Across C131 & D38 ?

Started by red2203stack

Pages1 2

Replies: 16
Views: 9,702

January 20, 2019, 04:36:13 PM
by red2203stack

Rack grounding?

Started by Georgeclooney0

Pages1 2

Replies: 29
Views: 12,151

December 04, 2018, 11:07:57 AM
by rabidgerry

front panel

Started by kserri

Replies: 3
Views: 5,853

December 03, 2018, 01:11:27 AM
by rnolan

ADA MP-1 Ground hum with good gain

Started by bunkyloo

Replies: 3
Views: 4,365

November 10, 2018, 02:50:27 AM
by MarshallJMP

New Member - just got an old MP-1 - no sound - it does turn on

Started by Overtone85

Replies: 1
Views: 4,045

October 30, 2018, 01:03:45 PM
by MarshallJMP

Mp-1 v2 mod 3 no output in tube anything

Started by bunkyloo

Replies: 10
Views: 5,976

October 05, 2018, 02:16:17 AM
by rnolan

MB-1 no output

Started by peoriashows

Replies: 7
Views: 6,346

July 28, 2018, 11:51:45 PM
by rnolan

MP-1 Flipping Presets

Started by Griphook

Replies: 10
Views: 6,784

July 26, 2018, 11:18:15 PM
by Griphook

MP1 v 1.38 no sound can someone help me out?

Started by Wormwoody

Pages1 2

Replies: 16
Views: 10,932

May 05, 2018, 10:06:19 AM
by Wormwoody

Viper trouble

Started by Dante

Pages1 2

Replies: 18
Views: 17,055

May 05, 2018, 01:24:28 AM
by MarshallJMP

No sound on select preset channels and weird output level knob behavior

Started by Andrew Smith

Replies: 2
Views: 5,020

March 07, 2018, 04:22:32 PM
by Andrew Smith

Help with MC-1

Started by Wimbish

Replies: 12
Views: 8,364

February 01, 2018, 04:44:14 AM
by rnolan

Got noise???

Started by Dante

Replies: 7
Views: 7,698

January 15, 2018, 12:27:21 AM
by rabidgerry

No Power, No Display, No Output

Started by Chip Roberts

Pages1 2 3

Replies: 38
Views: 20,515

December 23, 2017, 08:35:04 AM
by MarshallJMP

MP1 and Cold Exposure

Started by Chip Roberts

Replies: 2
Views: 5,580

December 10, 2017, 08:17:01 PM
by herbyguitar

MP-1- err 1 on startup

Started by tabascojunkie

Replies: 8
Views: 9,295

July 27, 2017, 03:50:00 AM
by MarshallJMP

MP-1 got Noisy...

Started by rabidgerry

Pages1 2 3

Replies: 34
Views: 21,526

July 02, 2017, 04:53:43 PM
by MarshallJMP

Viper probs, info moved from Schematics section

Started by guitardude57

Pages1 2 3

Replies: 32
Views: 18,631

June 02, 2017, 03:28:21 AM
by MarshallJMP

MP1 - > Midiverb II -> UX2?

Started by Chip Roberts

Replies: 9
Views: 6,625

April 23, 2017, 04:14:44 PM
by Harley Hexxe