Section III. PRELIMINARY OPERATING PROCEDURES
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. R e t u r n a l l c o n t r o l s t o t h e i r s a f e t y p o s i t i o n s ( p a r . 1 5 d ) w h e n
the tube tester is turned off.
c. Do not prolong the testing of tubes with filaments that draw
more than 3 amperes.
d. I n s p e c t t h e b a s e s o f s e v e n - a n d n i n e - p i n m i n i a t u r e t u b e s f o r
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.
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.
Tube type tested
Tube test socket
Four-pin standard tubes.
FOUR -----------------------------------------
Five-pin standard tubes.
FIVE -----------------------------------------
Loctal base tubes.
LOCTAL -------------------------------------
Six-pin standard tubes.
SIX --------------------------------------------
Seven-pin miniature tubes.
MIN. SEVEN ----------------------------------
Eight-pin, long-lead subminiature tubes.
SUB-MIN. EIGHT LONG LEAD_
Seven-pin transmitting tubes.
TRANSMITTING SEVEN PIN----------
Nine-pin miniature tubes.
NOVAL --------------------------------------
Octal base tubes.
OCTAL ----------------------------
Seven-pin standard tubes.
SEVEN ------------------------------------------
Acorn tubes.
ACORN ------------------------------------
Seven-pin subminiature tubes.
SUB-MIN. SEVEN ----------------------------
Eight-pin subminiature tubes.
SUB-MIN. EIGHT ----------------------------
p r o v i d e 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
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