Marantz 2230 (Unit #2) Repair Part 1 - Preamp One Channel Not Working

In this video I am sharing how to troubleshoot and repair a non-working channel in a preamplifier. Although my tester can't identify the defective transistor, I was able to find the problem and got it fixed. This video may serve as an example to deal with this type of issue of a preamplifiers.