I have used a GE-7 as a boost/overdrive in front of a Marshall for 25 years, and I've never thought it made an objectionable amount of noise.
(Now, my BF-2, that's another story...

)
I think the GE-7's noise is barely noticeable, but keep in mind I'm using it for a boost, and turn it off when the solo is over.
Fine Print:
This opinion is in no way influenced by the fact that, this very day, my beloved GE-7 which has served me well for many years but is nonetheless in very good condition, has gone up for sale. My new amp/playing style/venue require a true distortion box rather than just a booster. Any persons interested in purchasing said GE-7 should PM me.