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It feeds the grid of V2A. It looks unusual because it's a screened cable. Normally there would be a green wire going from the top of the PCB near where the cable tie is fitted.
Obviously the intent is to reduce noise or prevent oscillation, but I've never had a problem with the standard amp in this regard, so I can't see why someone would go to that trouble.
I can't tell from the photo, but is the resistor 470k ? (Yellow violet yellow ?)
If so, the same pin of V2 would normally be connected to the top of that resistor (via the PCB). The bottom of that resistor is connected to ground, so I guess that someone has used it as a convenient place to ground the screen of the wire.
Compare to this pic:
http://i433.photobucket.com/albums/qq60/charveldan/100_0299.jpg
Possible reasons would either be an attempt to reduce noise, or to avoid instability / oscillations.
If it ain't broke...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I've never had one that needed attention, but that said, if I'm doing any mods on these, I usually go round and shorten wires and can end up with enough wire to build another amp! It can make quite a difference.
On my own amps I shield grid wires as a matter of course.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein