So, you’ve put in a new matched set of power tubes. Every tube lights up as it should. But the sound is terrible, and the volume is way too low. That’s what the problem is with this classic Marshall JTM-45 Blues Breaker amp. Let’s get his baby sounding “Clapton Good” again. Could I get that elusive Beano sound?
You may also get a better understanding of terms like “Transconductance” and Gm.
Video Index
00:00 Introduction
00:32 What are your most influential albums?
08:45 Testing the power tubes
11:10 What is Transconductance and Gm?
16:20 Testing the Filter Capacitors
21:30 How to replace the filter cap that’s under a Marshall circuit board
29:50 Replacing the Bias Capacitors
35:50 The Fuse with a “ticking noise.”
38:20 A quick test for PreAmp tubes
39:10 Setting bias using an oscilloscope and Bias Probes
42:20 Why is one power tube not working? Two ways to check.
51:37 The difference between Cathode Current and Plate current.
56:27 The Sound Test. Did I get close to the Beano Sound?
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