Hi
I have finished tweaking up my Arcam alpha board. New caps on both boards, new diodea, new op-amps etc. Basiclly loads of stuff as advised. However i now have an issue. The machine when first plugged in work perfectly but after being on for maybe 30 mins passed a mains humm into the amp.
I have unshielded inteconnectcables but have replaced them with shielded one with no joy. I have also built several different mains cables and this hasnt helpped. The current one is a rather sophisticated one, this:-
http://www.tnt-audio.com/clinica/ttse.html
so i am pretty sure it isnt the mains cable. However if when it is humming i hold the mains cable the noise stops, as it also does when i touch the meatl work of the cd player. Does this mean the cd has a bad earth somewhere, I guess it does but before i take the whoel thing apart for the fifth time just wanted to check.
Fil
I have finished tweaking up my Arcam alpha board. New caps on both boards, new diodea, new op-amps etc. Basiclly loads of stuff as advised. However i now have an issue. The machine when first plugged in work perfectly but after being on for maybe 30 mins passed a mains humm into the amp.
I have unshielded inteconnectcables but have replaced them with shielded one with no joy. I have also built several different mains cables and this hasnt helpped. The current one is a rather sophisticated one, this:-
http://www.tnt-audio.com/clinica/ttse.html
so i am pretty sure it isnt the mains cable. However if when it is humming i hold the mains cable the noise stops, as it also does when i touch the meatl work of the cd player. Does this mean the cd has a bad earth somewhere, I guess it does but before i take the whoel thing apart for the fifth time just wanted to check.
Fil