On the DH 200 thak off the cover and find the MOSFET outputs. Take out the 2 screws and slip the MOSFET out of the socket. Clean all connections and slip the MOSFET back in ,put in the two screws and move on to the net output device. These have probably oxidized over the years and will benefit greatly.
Another simple thing you should do is bypass the input cap. Follow the input wires to the circuit board and you will see a 10mfd electrolytic cap there. Either bypass it completely or if you are not comfortable with the amp being direct coupled, replace the cap with a good film cap.
Both of these things are easy and will make the amp sound even better.
Another simple thing you should do is bypass the input cap. Follow the input wires to the circuit board and you will see a 10mfd electrolytic cap there. Either bypass it completely or if you are not comfortable with the amp being direct coupled, replace the cap with a good film cap.
Both of these things are easy and will make the amp sound even better.