Quote:
Originally Posted by dieseljeep
I bought some Zenith orange drop double caps at a swap-meet. They were NOS, loose in a large box. A beautiful, sun shiney day. They turned a darker orange color, by being out in the sun. I bought a few, for a buck each.  |
Beware the part numbers ! There are at least 3 different values
during the CC2 upright chassis era. One common one that comes
in a kit 800-860 ( on pkg but not part ). Another for the 13" and
one more for the EFL gun sets. I never noticed on later Sys3 sets.
I never seen them in bulk so be a little careful.
BTW what are the markings on them ??
Also they are single caps. One pair of wires completes the
collector circuit, other pair the emitter ( ground) path. They are
designed to open & kill the HV if the cap itself opens. You will
get good snd but zero HV. They can also short, then you get
loud hum followed by breaker trip. America Radionics ( white ones)
were not opening when the cap itself opened so the troubles.
Process for CRT necking is this.
S cap opens & HV goes up tward 50KV.
Vert module fails putting DC on the vert yoke winding.
Yoke overheats & cuts CRT glass.
Arcing damages much more usually.
This brings us to one more tip. Symptom is good snd, good HV
no raster OR a slight foggy dim haze. When you turn off
a line (no vert sweep) pops down from the top or up from bottom.
Its vert out fail that puts DC on the yoke & pulls the line off the
screen. Some electrons bounce around & make it causing the haze.
Since this can cause a necking dont run it long. Common in
Zenith, Maggy & others.
73 Zeno
