Leohobb

I have changed all capasitors on a Trace elliot gp12 smx preamplifier.also some quad pack opamps.I got a hum problem from fullrange outputs and xlr,s ,it get worce the closer to the transformator or the powersuppy section on preamp  pcb witch is close placed.the long multi lead cable does affect the hum also.have to get it close to pre pcb for low hum level.the voltage regulator 2 is hotter that reg 1.Somthing is not ok.advice would be helpful

On 09/12/2018 at 13:17, PaulWarning said:

I think I may have solved the mystery, happened again at the weekend, soundman said very low output from my GP12 SMX head, so I tried it at home, and yes very low output, until I took it off standby! then perfectly normal, so the standby button on SMX heads affects the DI

Yes the standby or mute button works in revese.Finaly somone found that out.It is clearly stated in the user manual.This button has nothing to do with tube warm up etc ,and it only work on dj xlr outputs/outputs not affected by master volum on gp 12 smx pre amplifiers