Tried out the effects loop over the weekend and whether I run one pedal through it, or loads, tried different cables, power supply or battery, the loop adds a high pitched whine to the sound, which makes it pretty unusable.
I'm going to re-try a load of things, again different pedals, batteries and cables, but do Marshall have any suggestions?
Also is there a way to change the level/mix of the effects loop, or is it fixed?
Is it possible to mod a Marshall Code 50 amp to add an effects loop that allows for running external effects through the power amp stage and bypassing the preamp stage? That is my main complaint of this amp- no effects loop.