Got a Technics SU-Z780 on the bench, equipped with SVI3205 chip.
Appears to be BPC however at low volume it's better than some
other budget buys, sound is respectable in this price range.
Problem is the amp clips at moderate/low volume, about 2Vp-p out
into load resistors as per pix. Both channels clip the same.
Checked psu, no disturbance/wobble at clipping point. Main caps
test ok, rest of the unit is clean with no hot spots etc. Fan works
when vol cranked up. Signal from pre looks ok.
Looking for ideas before I take it apart and check IC solder connections.
Since both channels the same suspect +/-B power connections maybe.
The dismantle looks like a PITA so thought I'd ask first.
Appears to be BPC however at low volume it's better than some
other budget buys, sound is respectable in this price range.
Problem is the amp clips at moderate/low volume, about 2Vp-p out
into load resistors as per pix. Both channels clip the same.
Checked psu, no disturbance/wobble at clipping point. Main caps
test ok, rest of the unit is clean with no hot spots etc. Fan works
when vol cranked up. Signal from pre looks ok.
Looking for ideas before I take it apart and check IC solder connections.
Since both channels the same suspect +/-B power connections maybe.
The dismantle looks like a PITA so thought I'd ask first.