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Index Structure
The index signal is generated by
the difference in secondary emission
between an array of magnesium
oxide stripes applied to the gun
side of the aluminized screen and
the bare aluminum between these
stripes. There are 2 contact buttons
on one side of the tube envelope,
and one of these is connected to the
screen aluminum coating, making
it possible to maintain the screen
potential at approximately 27 kv.
The second contact button connects
to the bulb coating which is
maintained at 30 kv. The 3 kv differential
between screen and bulb
coating results in collection of the
secondary electrons from the screen
by the bulb coating.
There is one magnesium oxide
stripe per triplet. The index stripes
are on a 40% duty cycle, that is,
40% of the triplet width is magnesium
oxide, 60% is bare aluminum.
This has been found to give
the maximum fundamental component
index yield.
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Fig. 8: Apple dual -beam electron gun
A comparison of the Apple tube
with a monochrome tube shows the
same size envelope for the same
size picture. (Fig. 1) Compared to
the other color tubes, the Apple
tube presents the largest picture
size in proportion to the envelope
size. The electron gun is more like
a monochrome gun than it is like
any multiple beam gun used in
other types of color reproducing
tubes (Fig. 8).
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