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Default Studiomaster Powerhouse Vision 8 , 700W mixer amp,1996

Didn't think when initially checking out, but what is the "group" slider
function,? no www user manual found.
Anyone any schematics for it ? (ps no emails to whatever this posting
apparently throughs up)
One channel clipping, then dropping out totally after a time, first problem
in preamp, imbalanced gain, second unknown pa or prea. At least possible to
swap the pa channels over it would seem , to resolve to pa or prea , if
nothing actually found.
Also what governs the fan startup, comes on at power up for 2 seconds
(presumably normal) switches off and comes on whan heated up but nothing
obviously separate from the amp/s for temp monitoring or total/channel
cutout, ie no relays, so some sort of gain control coming into play to kill
the channel.


 
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