Power supply board 6K amp

i am working on an kove armageddon 6K amp.
there is a jumper on the power supply board.does anybody know what is it for?
with jumper in right position (like on the pic) amp powers up normaly.
with jumper in left position amp powers up with high current draw and some fets become hot quickly
 

Attachments

  • 20200809_112645.jpg
    20200809_112645.jpg
    987.2 KB · Views: 151
  • 20200809_112702.jpg
    20200809_112702.jpg
    1.1 MB · Views: 119
This jumper is also present in the emphaser 13000spl, ground zero 10k and ampire 3k which i've for a repair right now and i've seen it in many other korean design amplifiers.

Ground Zero 1.4000dxii which basically is the same amp as Emphaser 13000spl DOES not have it.

I would like to subscribe to this threat, quite interesting