RANGE switch to the next higher position, and then adjust the
c o n t r o l until the correct voltage is indicated on the meter.
i. I f t h e l i n e v o l t a g e i s h i g h a n d i t i s n o t p o s s i b l e
to adjust
the FILAMENT fine control to indicate the specified
voltage,
turn the FILAMENT RANGE switch to the next lower
position,
and then adjust the control until the correct voltage is
indicated
on the meter.
When the procedures in paragraph 16 have been completed,
adjust the PERCENT QUALITY meter to zero. This adjustment
should be made before testing any tube for transconductance
(GM) as follows:
a. Turn the GM-SIGNAL RANGE
switch to the F position.
b. Depress the PRESS TO TEST P4 switch to its locking posi-
t i o n . Reset the controls to give the exact meter readings specified
i n the METER SETTING columns of the tube test data roll chart.
c. A d j u s t t h e G M C E N T E R I N G c o n t r o l u n t i l t h e p o i n t e r o f t h e
PERCENT QUALITY meter is set exactly to zero on the scale.
d. Release the P4 switch.
a. P e r f o r m t h e o p e r a t i o n s d e s c r i b e d i n p a r a g r a p h s 1 5 a n d 1 6 .
b. For the TV-2/U, aline the dot on the PLATE fine control with
the dot on the panel. For TV2A/U and TV2B/U, aline the
P L A T E fine control pointer-type knob with the line index marking
o n the panel. This assures that the correct voltage will be applied
to the short test circuit.
c. T u r n t h e S H O R T T E S T s w i t c h s l o w l y f r o m t h e O P E R .
p o s i t i o n to V, W, X, Y, and Z, and back to OPER.; at the same
time, tap the tube with a finger and watch the FIL. CONT. SHORT
indicator lamp.
Caution: Do not tap the tubes listed below when testing for
short-circuited elements. Tapping may damage the tube.
1LH4
1A5GT
1LN5
1A7GT
1P5GT
1C5GT
1Q5QT
1G4GT
1S4
1G6GT
1S5
1H5GT
1L4
1T4
1T5GT
1LA4
1U4
1LA6
1U5
1LB4
1LD5
3A4
1LE3
3A5
