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  C a u t i o n : Be careful not to hit the
C a u t i o n : Do not rock or rotate a tube when
meter case with tube type 83 when
removing it from a socket; pull it straight out
removing the tube.
with a tube puller.
( 3 ) R e p l a c e t h e t u b e (a a b o v e )
with
one
a.
Tube
Substitution
Method. R e p l a c e
a
of the running spares.
suspected
t u b e (b below) with a new tube. If
Set the tube (or a replacement) in
(4)
the equipment still does not work, remove the
the socket and secure it with the tube
new tube and put back the original tube. Repeat
clamp.
this procedure with the other tube. If the test
( 5 ) Replace the chassis in the case (par.
set
is
still
inoperative,
other
checks
are
re-
36b).
quired (par. 3 5 b ) .
b.
Replacing
Tubes
in
Test
Set,
Electron
A
preferred-type
electron
tube,
type
Tube
TV-7(*)/U. Check the tubes in the test
5Y3WGTA, has been developed as a direct re-
set as follows:
placement
for
nonpreferred
types
5Y3GT
and
(1)
Remove
the
chassis
from
the
case
5Y3WGT (par. 7). The 5Y3WGTA is used in
(par. 36a).
the
power
supply.
When
replacement
of
a
5Y3GT or a 5Y3WGT is necessary, replace it
(2) Remove the tube clamp (fig. 13) from
with a 5Y3WGTA. Do not substitute a 5Y3GT
the
threaded
stud
and
remove
the
or a 5Y3WGT for a 5Y3WGTA.
tube.
bayonet-type bases. Unscrew and remove the
Replacement of Lamps
PILOT lamp indicator jewel to gain access to
The FUSE, PILOT, and SHORTS lamps are
the PILOT lamp. To remove either lamp, press
removable from the front panel of the test set.
downward, turn the lamp to the left, and lift
a. T h e
FUSE
lamp
and
PILOT
lamp
have
straight up. To replace the FUSE or PILOT
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