Troubleshooting Problems

Fixing-up any old gear

Started by vansinn

Pages1 2

Replies: 15
Views: 20,276

February 15, 2017, 10:27:25 AM
by DannyjoeCarter

MP-1: degraded sound quality when panels open.

Started by Kazinator

Replies: 1
Views: 41

November 04, 2024, 05:05:30 AM
by rnolan

MP-1 v2.01 120hz hum and loss of drive

Started by guitarmutant

Replies: 3
Views: 152

October 27, 2024, 02:35:59 PM
by Kazinator

ADA MP-1 Master Gain Volume Issue

Started by charv712

Replies: 8
Views: 518

June 20, 2024, 01:13:10 PM
by MarshallJMP

MP-1: Improving ripple distortion in compressor.

Started by Kazinator

Replies: 1
Views: 748

September 01, 2024, 08:53:19 PM
by Kazinator

No SS voicing

Started by Tweeddeluxe1

Pages1 2 3

Replies: 41
Views: 928

June 28, 2024, 02:46:53 AM
by rnolan

MP-1 possible issues after noise mod (OD1 LED clipping at low gain)

Started by Loktite

Pages1 2 3

Replies: 38
Views: 1,050

November 05, 2024, 12:16:48 PM
by MarshallJMP

Loud pop/click when changing to a preset with clean tube voicing

Started by RobinL

Pages1 2

Replies: 25
Views: 1,099

July 29, 2024, 11:52:44 AM
by MarshallJMP

No chorus and distorted SS voicing after noise mod

Started by Moulashaker

Pages1 2 3 ... 6

Replies: 81
Views: 2,153

July 09, 2024, 11:53:15 AM
by Gregg

Srange Chorus problem

Started by Pete66

Replies: 2
Views: 2,693

September 26, 2020, 12:43:27 AM
by Pete66

no sound on outputs A and B, effects loop works

Started by ang3lus

Replies: 4
Views: 2,960

April 15, 2020, 01:27:32 AM
by rnolan

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

Started by Overtone85

Replies: 1
Views: 3,368

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

MOVED: Techniques and tooling

Started by rnolan

Replies: 0
Views: 3,368

April 16, 2016, 05:00:51 AM
by rnolan

MP1 wont work with either 2.0 or 2.01 EPROM

Started by rnolan

Replies: 3
Views: 3,369

June 15, 2019, 08:48:09 AM
by MarshallJMP

MP2 starts out quiet but gets gradually more noisey

Started by h.e.l.shane

Replies: 0
Views: 3,571

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

110v -> 220v

Started by Sirion

Replies: 2
Views: 3,631

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

ADA MP-1 Ground hum with good gain

Started by bunkyloo

Replies: 3
Views: 3,648

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

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

Started by BoWeevil2017

Replies: 1
Views: 3,712

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

B200s hum

Started by duecemfhatchet

Pages1 2

Replies: 16
Views: 3,715

November 02, 2024, 02:35:08 AM
by duecemfhatchet

Fixed: MP-1 with ALL clip leds lit solid and NO sound (long post)

Started by Pork_Chop

Replies: 2
Views: 3,716

November 12, 2021, 09:17:43 AM
by MarshallJMP