Thanks Gonk...the reason i'm asking this is in my region which is outside of US, we are using a 220v supply.So i will be using a step down transformer 220-110v.I don't want to keep the transformer plug on to power for a long time,for it will consume power even on standby.I believe a 15 KVA transformer is enough to power up-model 990/7125.

regards,
Noel