User's Manual

(1) An open circuit or infinite leakage between elements will
produce no deflection of the PLATE meter pointer.
(2) A short circuit between two elements will produce a full-
scale deflection of the PLATE meter pointer.
Note. Where the NOTES column indicates a short circuit, full-
scale deflection will appear at those settings.
(3) Read intermediate leakage values on the resistance scale
of the PLATE meter. The amount of leakage is indi-
cated in megohms.
e. When the test is completed, set the ON-OFF switch to the
OFF position, remove the tube under test from the test socket,
and return all switches and controls to their safety positions (par.
15d) .
20. Filament Continuity Test
a. Perform the operations in paragraphs 15 and 16.
b. If the filament continuity test is the only test to be made, set
only the FIL- and the FIL+ SELECTORS switches as indicated
in the tube test data roll chart. Leave the remaining SELECTORS
switches in their safety positions (par. 15d).
c. Operate the SHORT TEST switch to the V position. For the
TV–2/U, aline the dot on the PLATE fine control with the dot on
the panel. For the TV–2A/U, and TV–2B/U, aline the line mark-
ing on the PLATE fine control with the line marking on the panel.
d. Depress the PRESS TO TEST P1 switch.
(1) If the FIL. CONT. SHORT lamp glows, the filament is
good.
(2) If the FIL. CONT. SHORT lamp does not glow, the fila-
ment is open. Discard the tube.
Note. Occasionally a filament will show continuity when cold,
but will open when it warms up.
If this condition is suspected,
set the FILAMENT RANGE switch to the normal voltage for the
tube under test, let the tube warm up for several minutes, and
repeat the test.
21. Transconductance Test
a. Perform the operations described in paragraphs 15 and 16.
b. Operate the FUNCTION switch to the TEST position.
c. Operate the PLATE-SCREEN RANGE switch to the position
specified on the tube test data roll chart.
Warning: Do not touch the top cap of a tube under test after
plate voltage has been applied.
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