Silverface Pro Reverb UltraLinear will sound UltraSweet - PART ONE

This SilverFace Fender Pro Reverb is the vehicle for learning about UltraLinear amps. We also gain a better understanding of late Silverface Fenders and why they can sound SO good.
I am a firm believer in protecting vintage amps for future owners. “Future You” deserves to know how an original Fender, Marshall or Vox sounded … and not an unknown kid's digital impression. I do not see wholesale parts replacement as anything more than uneducated laziness, especially when their work is as sloppy as we can glimpse in this deserving beauty.
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Video Index
00:00 Introduction
01:00 External Inspection. Speaker Manufacturer & Date Code
06:00 Inspect and measure filter capacitors for capacitance and ESR
15:40 Inspect circuit and which items to test.
16:00 The purpose of the large 20w resistors in Silverface Fenders
17:50 Screen Grids in UltraLinear amps
25:45 My Repair Principle: As Curators, let’s retain vintage components as much as practical.
27:50 Minimal components failed testing
33:00 Mains power wiring: FAIL!
35:52 End of Part ONE