Korg GR-1 gated spring reverb noise

[ocoughi]

Greatings,
My Gr1 have some noise comming from the reverb output (nothing from the direct output) when i power on some delay hardware next to it. And only with delays! strange....
is there a way to fix this except placing the gr1 at more than 50cm from the delay?

other question:
i use it in mono (L). Is there an accutronic tank with similar impedance in order to change the right channel spring tank? so i can get very different sounding using Left or Right channel....

Thanks,
Musically,
Manu