Marantz 10b hum

Any ideas on how to cure a slight hum in a Marantz 10b? The only solution that I can think of is to replace the power supply capacitors.

usna200812-21-2010 10:02pm

usna2008 OP Details Discussions Posts This discussion Message User 2 posts 03-12-2011 at 02:33pm Copy Comment URL Report Comment Edit Delete I have now replaced every tube with a NOS tube and the hum persists. I then replaced the three 10uf and one 20uf electrolytic capacitors in the power supply. Still hums, but the sensitivity is excellent. Any other ideas? Thank you for any asistance you can offer.
usna2008 OP Details Discussions Posts This discussion Message User 2 posts 03-15-2011 at 09:12pm Copy Comment URL Report Comment Edit Delete Thank you for your response. The hum is heard through the speakers. It sounds like a 60 cycle hum.I will try reversing the power plug. I suppose it is not polarized.