TM 9-6695-274-14
(c) Envelopes should not be loose or
not be broken, cracked, or chipped.
warped.
(d) Tube pins should not be broken or
operate smoothly in all directions. (d) Lettering and other
bent.
markings should be clear, easily read and free from
(e) Tubes should be clean and free of
obstruction.
foreign matter.
(7)
Rotary switches
(10) Electronic tube sockets and mounts.
(a) Rotary switches should be securely
(a) Electronic tube sockets and mounts
installed.
should be securely installed.
(b) Controls should be securely attached
(b) Tube sockets and mounts should not
to the shafts and should not be broken, cracked, or
be broken, cracked, or chipped.
chipped.
(c) Rotary switches should operate freely
(11)
Fans and filters
in all directions.
(d) Indexes should be alined at all
(a) Inspect the filters and fan in
positions of the switch.
accordance with the manufacturer's manual or
appropriate TM.
(8)
Toggle switches
(b) Filters should be cleaned as described
in the appropriate publication.
(a) Toggle switches should be securely
(c) Check fan blades for accumulated
installed.
debris.
(b) Toggle switches should operate
smoothly in all positions. External contacts should be
(12)
Operational performance check
clean and free of foreign matter.
be
(a) Visually inspect the item and its
legible.
components to ensure that every component requiring
calibration has a calibration label verifying its accuracy,
(9)
Electron tubes
and that the calibration period specified on the label has
not expired.
(b) Ensure that the item is operating
(a) The correct types of tubes should be
properly, using the techniques prescribed in the
installed, securely seated, and firmly held in the socket or
manufacturer's handbook, as appropriate.
mount.
(b) Tubes should not be broken or
cracked.
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