amp emits low voume sound itself

Spr7560

Member
2012-06-04 11:20 am
FRIENDS!. Recently i buid a tip35c amplifier(pcb got from scrap market) with capacitive coupled output,single ps 60v. After completing assemble. I tested in quite room with speaker connected its performance ok with tighty bass. After removal of speaker,a volume sound is heard from amplifier board in order heaphones range. My question is where does sound comes it is capacitor or transitor?