WHY so few "other brands' left out there?( Admiral, Sylvania , Philco, etc)

[sampson159]

not all.some ss sets used the 25vaqp22.the higher end was the25vdmp22.i liked the way that crt looked but they had a short life span.we stocked vdc replacement crts and plenty of zenith 25v tubes.we offered rebuilds for 99.00 and used for 69.00.never had a used crt come back.the earlier 25vaqp22 had a very long life.some of those lasted 20-25 years.