problems with my old (but good) 820 mixer

[travel'insound]

Hi everybody !

I bought a Fostex 820 mixer a long time ago. It's the masterpiece of my studio with 2 ADAT's and my U87.
The problem is that my mixer is becoming noiser and noiser. I made more than 30 recordings and Cds with this equipment but the 820 produces now a BIG hum and some hiss which is unbearable compared to the rest of the devices.
I suspect it's about grounding...

Has someone met the same problem, perhaps with another Fostex mixer ?


Thank you in advance for your help.

Travel'insound