19AP4 Needed

[cwmoser]

I read somewhere that these old metal cone CRTs were not that bright anyway.
Something about that Aluminum coatings had not been discovered for CRTs
when they were produced. Read also that some rebuilt 16EP4s, 16GP4s, and
19AP4's were rebuilt with Aluminum coatings making it a much brighter tube.

I have 3 Porthole TVs. The 16EP4 and 19AP4 Zenith Porthole TV's I have
are dim but once warmed up is still viewable. My 16AP4 Rockwell Porthole TV
is much brighter but the contrast is not good. I have obtained a NOS 16AP4
that I have been meaning to install but have put off.