Matt,
NO , but, well, depends on a few things. The internal ICM ringing may be the culprit IF you have a lot of sets.
There is no outside, larger power card for the ITT 601 that I am aware of. The original is a plug in card. Now, all that being said, if you had a 2012 power source, and the 601 docs, it ain't clean but you can strap more power in the back of the set. You can also strap another card slot in the back...but that is another day.
....and the additional card slots (external) were a 239?, if I remember correctly (or was it 259?).
Have a good week.
