Markbass LMII problem

jmceachern36 · #1 08-03-2010, 08:18 PM

Had a problem with my amp the other night. Was wondering if anyone else has had it and what to do. I have a Markbass LMII and 2 Berg 1x12's. I started to lose volume right away as I started playing the other night. No crackling sound or anything, just loss of volume. I changed the outlet I was playing through and resumed playing without any problems til the last set and it happened again for about 50 seconds or so and then it was fine. I looked at the power light and it was still on and the fan was also working as well. Any thoughts? I've been using the same stuff for a few years now with absolutely no problems. I don't use any pedals or anything. Is there a way of testing the amp to see if it's ok? Any help would be greatly appreciated.

JimmyM · #2 08-03-2010, 08:38 PM

might not work, but sometimes amps develop corrosion in the effects loop if you don't use them. stick a plug into the loop jacks a few times really quickly and see if that helps. if you have contact cleaner, spray some into it as well before you move the plugs in and out.

jmceachern36 · #3 08-04-2010, 11:13 AM

I'll give it a try.

BassmanPaul · #4 08-04-2010, 12:35 PM

If Jimmy's suggestion works you can link the send and return jacks with a short signal cable like those for connecting effects pedals.

Paul

Jim C · #5 08-04-2010, 07:22 PM

A problem on some LMII's (including mine) is that the Neutrik connector at the rear of the amp is flakey.
Was 1/2 way through a set when mine quit; wiggle the connector and see if you can make the problem start and stop; the fix is to use a 1/4" cable instead.

alembicguy · #6 08-04-2010, 07:39 PM

Quote:

Originally Posted by Jim C

A problem on some LMII's (including mine) is that the Neutrik connector at the rear of the amp is flakey.
Was 1/2 way through a set when mine quit; wiggle the connector and see if you can make the problem start and stop; the fix is to use a 1/4" cable instead.

This worked for me when I was running my LMII. Went to a 1/4 chord and never had another problem.

jmceachern36 · #7 08-04-2010, 07:49 PM

Quote:

Originally Posted by Jim C

A problem on some LMII's (including mine) is that the Neutrik connector at the rear of the amp is flakey.
Was 1/2 way through a set when mine quit; wiggle the connector and see if you can make the problem start and stop; the fix is to use a 1/4" cable instead.

I actually already use a 1/4 inch cable. I was gonna buy some new ones to make sure it wasn't that.