User's Manual
Section III. PRELIMINARY OPERATING PROCEDURES
Tube test socket
Tube type tested
13. Operating Precautions
(fig. 3)
a. Do not insert a tube into a test socket until the SELECTORS
switches and the FILAMENT RANGE switch are properly ad-
justed (par. 16).
b. Return all controls to their safety positions (par. 15d) when
the tube tester is turned off.
c. Do not prolong the testing of tubes with filaments that draw
more than 3 amperes.
d. Inspect the bases of seven- and nine-pin miniature tubes for
bent pins before inserting the tube into the test socket. If any
pins are bent, straighten and aline them by inserting the tube
into the proper pin straightener (mounted on the inside of the
cover of the tube tester (fig. 1)) and pressing the tube down
firmly.
14. Tube Test Sockets and Test Adapters
After the controls on the tube tester have been set as directed
in the tube test data roll chart (par. 12), place the tube to be
tested in the proper tube test socket listed below.
a. Tube Test Sockets (fig. 3).
FOUR -----------------------------------------
Four-pin standard tubes.
FIVE -----------------------------------------
Five-pin standard tubes.
LOCTAL -------------------------------------
Loctal base tubes.
SIX --------------------------------------------
Six-pin standard tubes.
MIN. SEVEN ----------------------------------
Seven-pin miniature tubes.
SUB-MIN. EIGHT LONG LEAD_
Eight-pin, long-lead subminiature tubes.
TRANSMITTING SEVEN PIN----------
Seven-pin transmitting tubes.
NOVAL --------------------------------------
Nine-pin miniature tubes.
OCTAL ----------------------------
Octal base tubes.
SEVEN ------------------------------------------
Seven-pin standard tubes.
ACORN ------------------------------------
Acorn tubes.
SUB-MIN. SEVEN ----------------------------
Seven-pin subminiature tubes.
SUB-MIN. EIGHT ----------------------------
Eight-pin subminiature tubes.
b. Test Adapters. A test adapter X13B (fig. 1) is included to
provide a test socket for eight-pin, subminiature, long lead tubes.
Three test adapters (fig. 5) (X3B (eight-pin octal), X7B (nine-
pin noval), and X1OB (seven-pin miniature)) are included with
each TV-2B/U. The test adapters are installed in their corre-
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