This board produces low frequency hum even on switch on (volume at zero level). Some how it picks mains frequency (50hz). Powersupply was 24-0-24 12amp with 20000 +20000 filter caps. Well grounded.
Bro naan oru sakthi 4fet deluxe steroboarduse panninean transform 24 0 24 5 amps transformer use panninean one side speaker born aayidichu one side ic problem vanthuduchu itharku solution sollnga anna