User's Manual

Section IV. OPERATION UNDER USUAL CONDITIONS
16. Starting Procedure
Note. To start the equipment, first make sure the controls are set as
required by the preliminary starting procedure (par. 15) and then perform
procedures described in a through i below.
a. Locate the type number of the tube to be tested on the tube
test data roll chart mounted inside the cover of the tube tester.
b. Set the seven SELECTORS switches to the positions given
on the tube test data roll chart for the tube under test. Set the
switches in the order in which they appear on the tube test data
roll chart and on the tube tester panel, from left to right, starting
with the FIL-SELECTORS switch on the left-hand side.
Note. The seven SELECTORS switches are interconnected electrically so
that two different voltages cannot be applied to the same pin of the tube
under test at the same time. Thus, by setting the SELECTORS switches
in the order in which the switches are arranged on the panel, short circuits
are avoided.
C . Set the FILAMENT RANGE switch to the position indi-
cated on the tube test data roll chart.
d. Insert the tube to be tested into the proper test socket.
Caution: Be careful when inserting and removing loctal, acorn,
and subminiature tubes from their sockets. Excessive force will
crack the glass seals at the bases of the pins. Exert slight pres-
sure to one side to release the lock of the LOCTAL socket. Use
the pin straighteners mounted on the tube test data roll chart
housing to straighten bent pins of seven- and nine-pin miniature
tubes.
e. If the tube to be tested has a top cap, attach the A or B
electrical clip. Directions as to which clip to use are given in the
NOTES column on the tube test data roll chart unless the NOTES
column is required for other data. In addition, one of the SE-
LECTORS switches will indicate an A or B position. If the A
position is designated, use the A clip; if the B position is desig-
nated, use the B clip.
f. Set the ON-OFF switch to the ON position. The PILOT
lamp should g1ow. Allow at least 1 minute warmup time.
g. Adjust the FILAMENT fine control until the FILAMENT
VOLTS meter pointer indicates the exact filament voltages speci-
fied in the RANGE column of the tube test data roll chart unless
there is a note to the contrary. In the case of a filament voltage
of 0.625, 6.3, 12.6, or 117 volts, adjust the control until the meter
pointer is on the red calibration line on the
h. If the line voltage is low, it may not be
the FILAMENT fine control to indicate the
voltage.
When this condition exists, turn
appropriate scale.
possible to adjust
specified filament
the FILAMENT
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