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The Kinescope bulb encloses a high vacuum and, due to
its large surface area, is subjected to considerable air pres-
sure. For these reasons, Kinescopes must be handled with
more care than ordinary receiving tubes.
The large end of the Kinescope bulb — particularly that
part at the rim of the viewing surface—must not be struck,
scratched or subjected to more than moderate pressure at any
time. If the tube sticks, or fails to slip into its socket or de-
fleeting yoke smoothly, investigate and remove the cause of
trouble. Do not force the tube.
All RCA Kinescopes arc shipped in special cartons and
should always be left in the cartons-until ready for installa-
Figure 1— Operating Controls, TliK -9, TRK-90
The " Power-Volume** control on the radio receiver turns
on the power for the complete receiver. The "Victrola,
Radio, Television" control selects the type of operation de
sired. There are three Victrola fidelity positions, four radio
fidelity positions and three Television sound fidelity posi
tions on this switch. The furthermost, clockwise position be
ing the highest fidelity position for Television sound.
Television Operation:
Station Selector and Fine Tuning.—The outer ring " O "
section of the central dual control knob on the Television
panel selects the station from which it is desired to receive
Television transmissions.
Five Television channels arc covered as follows:
(1) 50 to 56 me. |
(2) 60 to 66 me.
(3) 66 to 72. me.
(4) 78 to 84 me.
(5) 84 to 90 me.
Set the station selector to the number corresponding to the
frequency of the station from which it is desired to receive
Television broadcasts.
The inner section .* , l " of this knob is used for fine tuning
and may eliminate moving ripples or distortion if due to
interfering radio signals.
Before the Television portion of the receiver is turned
"O N " it is advisable to turn the Brightness and Contrast
controls completely counter-clockwise to reduce the illumi-
Precautions in Handling Kinescopes
Operation
( R A D I O C O N T R O L S )
TRK9, TRK90, TRKI2, TRKI20
tion in the receiver. Keep the carton for future use.
The RCA-12AP4/1803-P4 (1 2-inch) Kinescope is equipped
with a protective lid and shield. Do not at any time remove
the close-fitting cone-shaped section of the protective shield
from the Kinescope. This section should be installed with the
tube in the cabinet and is designed to protect the user while
handling the glass bulb.
CAUTION: Do not open the shipping carton, install, re
move, or handle the Kinescope in any manner, unless shatter
proof goggles and heavy gloves are worn. People not so
equipped should be kept away while handling Kinescopes.
Keep Kinescope away from the body while handling.
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Figure 2—Operating" Controls, TRK-12, TRK-120
nation of the spot which appears on the Kinescope before the
sweep circuits have started functioning.
Contrast and Brightness Controls.—The inner " I — section
of the "Contrast"-" Brightness" controls is the "Contrast"
control and varies the black and white tones of the picture
being received. Too much contrast gives blurred details and
a lack of half-tones, while too little contrast makes it all half
tones or grays. Turning clockwise increases contrast from
grays, to black and white. Sec Operating Instructions for this
The outer ring " O " is the Brightness Control and affects
the average illumination of the picture. Turning clockwise
increases the brightness. See Operating Instructions for this
receiver.
- An approximate adjustment for proper contrast'is to turn
the ''Contrast** control fully counter-clockwise, then turn the
" Brightness" control until the screen is slightly illuminated.
Then reduce the Brightness control just sufficient to make the
screen dark, then bring ur> the Contrast Control until the
picture appears. A slight further adjustment of the Bright
ness or Contrast control may he necessary in some cases. A a
slight readjustment of the contrast control may aid synchroni
zation of* the picture.
Hold Controls.—The dual knobs on the Television panel
marked ''Horizontal" and " Vertical" Hold, control the pic
ture stability. The inner section designated by a " I" is the
Horizontal Hold Control and when, being set should be
turned slowly to the point at which the picture "locks in"
horizontally!>Scc Operating Instructions for this receiver.
The outer ring section designated b y " 0 " is the Vertical
Hold Control and when being set should be turned to the
point where the picture "locks in" vertically.
These two controls, on this dual knob should not ordinarily
require readjustment after good picture reception has once
been obtained. An occasional resetting m aybe necessary due
to changing to a different station, and to the gradual aging
of the tubes.
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( T E L E V I S I O N
C O N T R O L S )
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