Troubleshooting Problems

front panel

Started by kserri

Replies: 3
Views: 4,751

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

No Distortion on the Distortion Channel

Started by Misticmyst73

Replies: 2
Views: 4,706

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

error codes

Started by Mike_Revis

Replies: 3
Views: 4,442

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

Mp-1 v2 mod 3 no output in tube anything

Started by bunkyloo

Replies: 10
Views: 4,434

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

MP1 and Cold Exposure

Started by Chip Roberts

Replies: 2
Views: 4,364

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

MP-1 Classic dead

Started by tangohf

Replies: 4
Views: 4,285

December 07, 2014, 04:50:19 PM
by MarshallJMP

Hum and Crack on DIST mode

Started by Jonar

Replies: 3
Views: 4,098

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

Bad buzz or rumble on mp-2 high gain modes

Started by h.e.l.shane

Replies: 2
Views: 4,071

July 14, 2014, 09:43:55 AM
by W.Laturno

MP1 1.38 - Is my Chorus failing???

Started by skarkowtsky

Replies: 11
Views: 3,874

May 09, 2021, 02:50:58 AM
by MarshallJMP

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

Started by Andrew Smith

Replies: 2
Views: 3,865

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

Rear Input Jack

Started by Jaster

Replies: 1
Views: 3,840

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

Light went out on MP-2 display

Started by Ekornbakke

Replies: 2
Views: 3,836

November 19, 2014, 05:22:06 AM
by rnolan

V1.38 gain drop/loss just seconds after startup / warmup (solved)

Started by Systematic Chaos

Replies: 11
Views: 3,764

October 28, 2022, 07:26:03 PM
by rnolan

MP-1 full refurb and restoration

Started by Systematic Chaos

Replies: 4
Views: 3,638

November 23, 2022, 07:09:05 AM
by MarshallJMP

MB-1: Brand New Tubes, no sound on "Edge" or "Full" settings...

Started by BoWeevil2017

Replies: 1
Views: 3,414

February 21, 2017, 12:57:24 PM
by MarshallJMP

Midi issues

Started by dannyde

Replies: 1
Views: 3,374

April 12, 2014, 07:17:04 PM
by rnolan

110v -> 220v

Started by Sirion

Replies: 2
Views: 3,346

January 05, 2017, 09:07:01 AM
by MarshallJMP

MP1 - Developed very loud hum on tube settings

Started by MR THUD

Replies: 8
Views: 3,281

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

MP2 starts out quiet but gets gradually more noisey

Started by h.e.l.shane

Replies: 0
Views: 3,281

July 21, 2014, 10:39:10 PM
by h.e.l.shane

ADA MP-1 Ground hum with good gain

Started by bunkyloo

Replies: 3
Views: 3,177

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