Biasing a '65 Fender Bassman

The electricians are still in and out of the wood shop so I can't work out there today! We have an old Fender Bassman, which is one of our favourite amps. We've been noticing lately that it hasn't been sounding as good as usual so, it's time to replace the tubes. I thought this would be a good opportunity to show you how I bias a tube amp. This one is a bit long but, there's a lot to cover.

Chapter Markers
00:00 Intro
00:15 Disclaimer (BE SAFE)
01:17 What's Going on In the Wood Shop
02:48 The Amp
04:26 Types of Bias
07:12 Grid Bias
09:01 Fixed vs Adjustable Fixed Bias
09:47 Bias Balance?
13:36 Considerations
18:16 Outside/Inside
19:13 Data Tracking Chart
21:44 Dissipation
23:36 Drain the Capacitors
25:40 What's a "Pull"
26:43 Measuring OT Resistance
28:17 OT Voltage Drop
30:06 Plate Voltage
31:36 Calculations
34:06 Bonus Biasing Method
38:39 Adjusting the Bias
42:21 Analyzing the Data
51:21 Conclusion
51:50 Outro

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