RANGE switch are set as in a(2) through (4)
above,
and
the
FILAMENT VOLTS meter indicates 6.3 volts,
(1) Set the PLATE switch to the 5 position.
(2) Set the PLATE-SCREEN RANGE switch to the S posi-
tion.
(3) Adjust the PLATE fine control until the PLATE meter
indicates 20 volts ac.
(4) Turn the quality SHUNT control to 90.
(5) Set the GM-SIGNAL RANGE switch to the A position.
(6) For the TV-2/U, aline the dot on the knob of the GM
CENTERING control with the dot on the panel. For
the TV-2A/U and TV2B/U, aline the line marking on
the GM CENTERING control with the line marking on
the panel.
(7)
Depress
the
PRESS
TO
TEST
P2
switch
and
read
the
PERCENT
QUALITY
meter.
If
the
indication
is
less
than the minimum limit of 25, discard the tube. If the
indication is satisfactory, measure the emission of diode
No. 2.
h. Measurement of Emission (Diode No. 2). To
measure
the
emission of diode No. 2, adjust the tube test data roll chart so
the third line on which the 6SQ7 tube appears is between the
horizontal red lines. The FUNCTION switch, all SELECTORS
switches except the PLATE switch are set as in g above, and the
FILAMENT VOLTS meter indicates 6.3 volts.
(1) Set the PLATE switch to the 4 position.
(2)
With
the
PLATE-SCREEN
RANGE
switch
on
S,
ad-
just
the
PLATE
fine
control
until
the
PLATE
meter
indicates 20 volts ac.
(3) The quality SHUNT control remains on 90.
(4) The GM-SIGNAL RANGE switch remains on S.
(5) For the TV-2/U, aline the dot on the knob of the GM
CENTERING
control
with
the
dot
on
the
panel.
For
the TV-2A/U and TV-2B/U, aline the line marking on
the GM CENTERING control with the line marking on
the panel.
(6)
Depress
the
PRESS
TO
TEST
P2
switch
and
read
the
PERCENT
QUALITY
meter.
If
the
indication
is
less
than the minimum of 25, discard the tube. If the indica-
tion is satisfactory, the tube is good.
36
