Troubleshooting Problems

Rear Input Jack

Started by Jaster

Replies: 1
Views: 3,760

March 16, 2015, 04:05:22 AM
by rnolan

Hum and Crack on DIST mode

Started by Jonar

Replies: 3
Views: 4,022

August 31, 2014, 01:28:19 PM
by MarshallJMP

MB-1 Error Messages

Started by kawai2g4b

Replies: 2
Views: 5,159

November 29, 2013, 08:14:48 PM
by kawai2g4b

U.S. MP-1 Repair

Started by kfowler8

Replies: 5
Views: 5,314

September 06, 2016, 06:28:36 PM
by kfowler8

Battery Issue in MP-1

Started by kfowler8

Pages1 2

Replies: 18
Views: 15,184

March 27, 2015, 01:07:53 PM
by MarshallJMP

MP-1 high pitch squeal

Started by kfowler8

Replies: 13
Views: 8,531

September 09, 2014, 01:13:59 PM
by kfowler8

Front panel don´t work

Started by kserri

Replies: 5
Views: 5,077

January 30, 2015, 04:21:33 AM
by rnolan

front panel

Started by kserri

Replies: 3
Views: 4,594

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

MP1 Classic Err 7

Started by leninvargas

Replies: 6
Views: 4,546

May 08, 2023, 12:50:40 PM
by MarshallJMP

Very Strange Behaviour

Started by MikeB

Replies: 4
Views: 5,632

June 12, 2015, 03:21:17 PM
by MikeB

Programming patches - inconsistent behaviour

Started by MikeB

Replies: 4
Views: 4,720

March 18, 2015, 09:39:15 AM
by MarshallJMP

error codes

Started by Mike_Revis

Replies: 3
Views: 4,325

March 27, 2014, 03:45:20 PM
by MarshallJMP

No Distortion on the Distortion Channel

Started by Misticmyst73

Replies: 2
Views: 4,574

December 05, 2013, 04:44:31 PM
by SidecarJoeG

Solid State Clean Gets Nasty

Started by Moff40

Replies: 5
Views: 1,470

August 29, 2022, 09:34:51 PM
by Moff40

LED Issue MP1

Started by Mojave

Replies: 4
Views: 3,970

December 31, 2023, 12:47:45 PM
by Mojave

MP1 Tube board issues, like am radio

Started by monty

Pages1 2

Replies: 20
Views: 13,126

January 22, 2016, 12:35:39 AM
by tomy

ADA MP1 - Tube Board Problem and Resolution.

Started by MR THUD

Replies: 2
Views: 2,269

November 12, 2021, 09:19:51 AM
by MarshallJMP

MP1 - Developed very loud hum on tube settings

Started by MR THUD

Replies: 8
Views: 2,200

August 29, 2022, 11:38:14 AM
by MarshallJMP

MP-1 A channel much quieter than B

Started by Mxzx

Pages1 2 3

Replies: 31
Views: 15,443

February 12, 2014, 06:32:21 PM
by El Chiguete

Extreme hiss and microphonic V1 tube circuitry

Started by NeverAfter

Pages1 2

Replies: 19
Views: 10,571

May 06, 2016, 10:33:18 AM
by rnolan