Musical Fidelity A1000 Humming Issue


I have a Musical Fidelity A1000 integrated amp which lately has hum (~120 Hz) leaking from its separate power supply unit through the speakers after about 10 minutes of operation. I wonder if anyone has encountered this issue before? Also, does anyone know of a good Musical Fidelity repair shop in the LA/San Diego area? Thanks.
englong
I ahve a A1000, sent it off to j s audio repair ex musical fidelity service manager. Did a fantastic job on it, i also hed my power supply upgraded.
Jb4-
Where is j s audio repair located? I may need to get my Tri Vista SACD player worked on.
Thanks-
Steve