Soldano SLO 100 making mysterious sounds

This beautifully hand-crafted Soldano amp was making a mysterious noise. There was a “leakage” of the Overdrive channel into the Clean channel. We will be tracking down this mystery noise using our ears and our oscilloscope. Join me as we discover the source of this noise and our solution to the problem.
Index of Interesting Bits
0:00 Introduction
1:43 Problem Description
5:00 Let’s hear the Problem
6:30 Let’s see the Problem on the Oscilloscope
7:50 Analysis of the channel switching circuit
14:40 A possible Solution
19:04 It works! No more “leakage”
20:25 Calculating maximum power in the Clean and Overdrive channels
23:18 Let’s audition the Soldano SLO100