FAQ What is the break-in period for the CAD 120S MKII amplifier? The tubes, capacitors, and output transformers take approximately 100 hours to settle in for peak performance.How do I replace the tubes in the CAD 120S MKII amplifier? A matched set of output tubes of the same name brand should be used. A new tube kit is available from Cary Audio.What is the bias adjustment procedure for the CAD 120S MKII amplifier? After the amplifier has been powered up for a few minutes, observe the meter readings and adjust the bias for each channel accordingly.
