I am in the process of restoring my Rotel RA-810A that is sounding very concise & balanced, really like it. The following small problems are found:\
1) When selecting Phono there is a significant hiss-interference sound coming from the output, when turning the volume past noon, gets louder. With the cover removed passing your hand near the components of the preamplifier stage I noticed the interference getting worse.
2) Some cross-talk between inputs.
3) Excessive thump on speakers upon turning-on and off.
I can fix this by adding a delay module+DC protection.
4) The voltages on the schematics are near 4-6 volts lower than the ones measures on the board.
5) Strangely the model RA-920AX, almost identical specs, has voltages closer to the ones found on my amplifier.
Any suggestion would be appreciated........thanks
1) When selecting Phono there is a significant hiss-interference sound coming from the output, when turning the volume past noon, gets louder. With the cover removed passing your hand near the components of the preamplifier stage I noticed the interference getting worse.
2) Some cross-talk between inputs.
3) Excessive thump on speakers upon turning-on and off.
I can fix this by adding a delay module+DC protection.
4) The voltages on the schematics are near 4-6 volts lower than the ones measures on the board.
5) Strangely the model RA-920AX, almost identical specs, has voltages closer to the ones found on my amplifier.
Any suggestion would be appreciated........thanks