I dont know why. Zenith & RCA had between 40% & 50% market share
in both B&W & color for yrs. Zenith always sold a few more & stayed
on top. So you should see apx the same. And 50-60% of ALL others.
As far as hand wiring goes you should never mix PCB's with tubes.
Look at the hook up wire. Most is braided & tinned with rubber
insulation then covered with cloth. The cloth had tasteful colors & tracers
in lots of shades & were color coded to the set. Example white / blue
is AFT. Yellow is video, etc. They must of spent millions over the yrs
on that wire. Premium parts were common such as the use of Bel fuses
& Sprague caps.
Enuf fer now
73 Zeno
LFOD !