Thanks for all your constructive input, guys :-)
I did contact Krell and quickly received a helpful, if not conclusive, reply. I was hoping for a categorical, ’under normal conditions, our amps are virtually silent’ but it did fall a little short of that.
’It appears to be residual transformer hum and happens more frequently than one might think and shows up more in 50Hz environments. Usually residual hum is heard only when in close proximity to the units. 5 ft away is unusual... Other than replacing the transformer, which does not always fix this problem, I am sorry to say that there is not a fix for this phenomenon.’
He also said that you don’t need to short the balanced inputs on Krell’s integrated amps when not used.
I did press firmly with my hand on the unit which also has no effect.
I did contact Krell and quickly received a helpful, if not conclusive, reply. I was hoping for a categorical, ’under normal conditions, our amps are virtually silent’ but it did fall a little short of that.
’It appears to be residual transformer hum and happens more frequently than one might think and shows up more in 50Hz environments. Usually residual hum is heard only when in close proximity to the units. 5 ft away is unusual... Other than replacing the transformer, which does not always fix this problem, I am sorry to say that there is not a fix for this phenomenon.’
He also said that you don’t need to short the balanced inputs on Krell’s integrated amps when not used.
I did press firmly with my hand on the unit which also has no effect.