7-2 ELECTRON TUBES (Continued)
Cut lockwire and remove four screws (1) and
preformed packings (2), then detach cover (3).
Note locations of individual tubes (5) and remove
tubes and shields (4) by pulling covers from tubes and
tubes from sockets.
Inspect glass envelope for cracks or looseness at the
base, either of which fault shall be cause for rejection.
Examine base pins for looseness or bending; slight
bends may be carefully straightened, loose pins shall be
cause for rejection.
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