On Apr 28, 10:48 am, wrote:

The demand went away because:

1) Electronics became more reliable and less expensive, so the repair
demand went way down
2) Building your own became a niche activity, so the homebrew demand
went down
3) Mail order and online suppliers took what was left.

Add:

4) All the hams have a basement full of defunct Silvertone, Zenith,
and Admiral TV's from which we canabalize parts to repair our new
Gonset, Swan, and Hallicrafter rigs.

73, de Hans, K0HB