Hi Guys,
I got a vintage technics SU-7200 stereo integrated amp last week (1976 model, aluminium front panel & wooden case). one channel was not working and it fixed by changing the fuse. controls were not smooth and fixed it by applaying video 90. cleaned the whole amp properly by CRC and resoldered all component solderings in the printed circuit board. now its working but giving excessive humm in both channels. this humming starts immediately after switching on the amp irrespective of input selection and volume bass treable control position.
please help me for solving the issue
thanks
I got a vintage technics SU-7200 stereo integrated amp last week (1976 model, aluminium front panel & wooden case). one channel was not working and it fixed by changing the fuse. controls were not smooth and fixed it by applaying video 90. cleaned the whole amp properly by CRC and resoldered all component solderings in the printed circuit board. now its working but giving excessive humm in both channels. this humming starts immediately after switching on the amp irrespective of input selection and volume bass treable control position.
please help me for solving the issue
thanks