Have a kma 200 krell amp running cool. It has 2 trim pots at the back left side. One for dc offset and the other for biasing current. Don't know which one does the bias setting? Original owner. Amp was in storage for 18 years. The other kma 200 amp runs warm. ( normal ).sounds ok but don't know if it's running in class a. I don't have a scope. Every thing looks OK no leakage or swelling inside. But I think the bias trim pot needs adjusting. Don't have any service manual. Have contacted krell service center. No reply yet. Any suggestions as to how I should proceed?
