Heathkit AA-18 Solid-State Amplifier: Restoration, demonstration, theory (& making a speaker for it)

In this video, I talk about a piece of vintage electronic audio equipment, the model AA-18 by Heathkit, which was their most popular and long-produced audio product; "The little Amplifier that could". I cover my history with this model, my restoration of one example, and demonstrate my tests on the unit and give a brief demonstration of it in use. I also go through the Heathkit assembly and owner's manual, and present the schematic diagram while discussing the circuit theory.
But that is only part of this long video. At least half of the video details my design and fabrication of a custom speaker/line-level audio mixer and its wooden cabinet, using almost entirely only things I had laying around.
Here is the index using timeline markers:
00:00 Introduction
05:42 History
15:26 Overview
23:57 Restoration
29:28 Testing
37:26 Speaker cabinet design
51:07 Speaker cabinet fabrication
1:59:59 Sound demonstration of amplifier & speaker
2:02:17 Manual overview
2:04:48 Schematic diagram & circuit theory

[@WayneKnight_Rider]

my father just asked me to repair an AA-18 he purchased a few years ago. starting by changing all the electrolytics. great to have this video as a reference!

[@WayneKnight_Rider]

just got my dad’s fully repaired. seeing the same voltages and getting that initial short buzz as well. sounds surprisingly good!

[@ltdude3383]

Great video
Really like how long and detailed your videos are
You made a wonderful little speaker testing box 👍 maybe if you take the stuffing out, it may sound a little bassier
And I think front speaker screw buttons look better gives it depth and matches with the side input bored
Look forward to your next video
Thanks