In this video you learn:
• How to improve the grounding in the power supply stage
• How to redesign the cathode bypass capacitors using an online program.
• If you can safely increase the Bias capacitor values
• How to test and bias the quad of EL34 power tubes
Video Index
00:00 Introduction
00:43 JTM to JMP period in Marshall history
05:27 Schematic comparison of Superbass and Superlead
09:30 Improve ground / earth in Marshall amps
13:45 Use a free online program to calculate Cathode Bypass Capacitor values
18:49 How to split cathodes in Superlead conversion
34:00 How to identify a Cathode Follower
36:00 Bias Capacitor replacement. What value?
41:00 Test power tubes for Plate Current and Transconductance
43:22 Biasing the power tubes
45:50 The sound test