Kenwood Model 500 integrated amp (Supreme series) 100W for sale in San Francisco, CA
The Kenwood Model 500 integrated amplifier is a series variant that has the same build and circuit design as the Model 600 but with a rated output of 100W -- 100% FET preamp, dual mono construction, and a well-designed power amp with a FET differential input stage. You can read about the Kenwood Model 500/600 in online audio forums and "thevintageknob." This amp is partially restored: a tech rebuilt the power supply board, upgraded the power supply transistors with higher heat tolerance (the original transistors tend to run hot on the right side), recapped each amp channel, and replaced amp board trimmers for optimal bias/offset adjustment to spec. It has the original Sanken output transistors, which are certified in spec. They were removed, cleaned, and reinstalled with new insulation. The main filter caps were found to have very low ESR and are operating in spec. All switches cleaned. The Model 500 is in good condition for its age but has some small incidental hairlines on the left side.
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