Marantz 10b hum

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.

Have you tried reversing the 10b's a/c plug orientation in the wall?

And to clarify: Do you hear the hum from the Marantz itself or the speakers?

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.