Mark Five 25 FX Loop Volume Issue

[sedagive]

Hi all,
It's been about a week since I picked up my new Mini Mark. I've been a full size Mark V owner for a year and it is by far my fav amp of all time.

So when first testing out the new amp, I simply pulled the cables from my Mark V and put them in the 25. I have a small pedal board with an Eventide H9, Decimator 2 in the loop and a Maxon OD and Morley wah in front of the amp.

Everything sounded as great as I expected it to. So I set the amp up on its own with a Mesa 1x12 cab and a T.C. Electronic Flashback delay in the loop. Guitar straight into the amp. WHAT HAPPENED? There is barely any volume now. I changed every cable, tried three different guitars. Still no volume. So the first thing I try is disconnecting the loop. Volume is back. But now whenever I put something in the loop - no volume. I reconnected my original board from my Mark V and now that doesn't have any volume.

So as far as I can tell, the issue is with the FX Loop. I'm wondering if anybody else has experienced anything like this and found a quick fix or something stupid that I may be overlooking. I have a call in to Mesa but it's the day before Thanksgiving and probably won't be hearing from them until Monday. I plan to bring the amp back to the Mesa Hollywood Store where I bought it if they are open on Friday.

But I just thought I would put this on here in case somebody has been down the same road and found a quick fix.

 

[paulg2uk]

Hi all,
It's been about a week since I picked up my new Mini Mark. I've been a full size Mark V owner for a year and it is by far my fav amp of all time.

So when first testing out the new amp, I simply pulled the cables from my Mark V and put them in the 25. I have a small pedal board with an Eventide H9, Decimator 2 in the loop and a Maxon OD and Morley wah in front of the amp.

Everything sounded as great as I expected it to. So I set the amp up on its own with a Mesa 1x12 cab and a T.C. Electronic Flashback delay in the loop. Guitar straight into the amp. WHAT HAPPENED? There is barely any volume now. I changed every cable, tried three different guitars. Still no volume. So the first thing I try is disconnecting the loop. Volume is back. But now whenever I put something in the loop - no volume. I reconnected my original board from my Mark V and now that doesn't have any volume.

So as far as I can tell, the issue is with the FX Loop. I'm wondering if anybody else has experienced anything like this and found a quick fix or something stupid that I may be overlooking. I have a call in to Mesa but it's the day before Thanksgiving and probably won't be hearing from them until Monday. I plan to bring the amp back to the Mesa Hollywood Store where I bought it if they are open on Friday.



But I just thought I would put this on here in case somebody has been down the same road and found a quick fix.

Sounds like a preamp tube to me. The FX loop is buffered so it would be making use of an 12ax7 to make it work. I'd try replacing the the tube that controls the FX Loop first. Either that or it could be the V1 preamp tube. If that goes down everything tends to. If its still under warranty though I'd probably wait and take it back before you start messing with it.

Its weird because I've been having a similar issue but instead of no signal I get like the signal is lacking somewhere. I thought maybe it might be my new pedalboard as it happens with both my mark v 25 and rect-verb 25. Plugging in normally with nothing in the fx loop works fine.

 

[Steve2014]

Hi,

I am no expert on the Mark V but I have just got a Mini Mark V: 25, I also have a TC Flashback x4 in the loop working fine.

Just a thought, if you have been using your Mark V loop in full parallel (as I see the V has a variable send level on the loop i.e. full series to full parallel I think) you will have enabled the 'kill dry' on you Flashback so only the effect is in the loop. The Mark V:25 loop is series only thus you will need to make sure 'kill dry' is off on the Flashback so both the dry & effect signal return to the amp.

Steve