FX LOOP WEAK

Metaghius · Jan 7, 2010

when loop is bypassed my amp is what i love about my amp however with the loop engaged my sound if distorted and weak...I have seen many post about the FX loop problem generally due to the tube 4 on the 3 channel triple rectifier...i have changed that one with many different 12AX7s and it seems to still not be as clean as the bypassed tone...

I also notice with the fx loop engage so i can run my pedals into the signal chain the delay will still bleed thru with the fx disengaged from the foot pedal. very strange...

I just retubed the power tubes with Mesa 6L6's matched pairs 2 weeks ago...preamp tubes are about 2 years old...

Does anyone know what resistors and cap and whatever else the is associated with the tube 4 / loop to check.

bobby

hallith · Jan 17, 2010

Check out your cables in the effects loop. I once had bad cables and the loop was weak or did not work.

Gtr_Pkr · Jan 18, 2010

I would replace the preamp tubes also. You say they are 2 years old, so that might need some attention.

Metaghius · Jan 19, 2010

just got it back from the repair shop...turns out I had 6 bad FET J175's in the fx loop. He said this is the main thing he repairs with Mesa's...so if you are having loop distortion that may be your problem also...cost 150.00 to get fixed...I think that is a good price..

Metaghius · Feb 10, 2010

loop is still not fixed...but only noticeable on the clean channel..its very distorted and weak..dirty channels are ok

fireonhigh · Feb 10, 2010

Metaghius said:
loop is still not fixed...but only noticeable on the clean channel..its very distorted and weak..dirty channels are ok

at 150$ maybe take it back where you had it serviced?....i have found out the hardway, that when ever my amp breaks down,send it to Mike B!! its nice to talk to the guy that built your amp!...GOD I LOVE MEASBOOGIE!!the damned idiots around cent.fl no nothing about amps!