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  Function
Pushbutton switch
Function
Switch or control
Action
Switch position
SHORTS: Positions 1-5 con-
FUNCTION SWITCH
Normal
Removes plate and
nect various
(11-position,
8-sec-
screen grid (when
elements of
tion rotary switch
used) voltages
tube under test
(TV-7D/U), 10-
from tube under
to shorts test
position, 6-section
test.
circuit.
rotary switch on all
4-GAS 1 . . . . . . . . . . . . . .
Depressed
other models)
Connects ac test
R A N G E S : Positions A-E
voltage to certain
(A-F, TV-
diode tubes and
7D/U) control
connects plate
sensitivity of
voltage and bias
meter circuit
voltage to tube
and magnitude
under test when
of signal volt-
checking amplifier
age.
tubes for gas.
Adjusts amount of input
L I N E ADJUST control
Removes diode test
Normal
voltage to power trans-
voltage or plate
former.
voltage and
Adjusts amount of bias volt-
BIAS control. . . . . . . . . . . . . .
bias voltage from
age applied to tube under
amplifier tube
test.
under test.
Adjusts sensitivity of meter
SHUNT control . . . . . . . . . . .
5-GAS 2 (used
Depressed
Connects a resistor
circuit.
with 4-GAS 1
into control grid
when amplifier
circuit of tube un-
b.
Pushbutton Switches.
tubes are tested
der test.
for gas)
Normal
Short-circuits re-
Pushbutton switch
Function
sister in control
Switch position
Action
grid circuit of
Depressed Connects meter into
1-LINE ADJ . . . . . . .
tube under test.
line test circuit.
Depressed
6-OZ4. . . . . . .
Connects tube under
Normal
Disconnects meter
test to an ac test
from line test cir-
voltage. a
cuit.
Normal
Removes ac voltage
Depressed Connects diode tube
2-DIODE . . . . . . . . . . . . .
from tube under
under test to an
test.
ac test voltage,
7-RECT. . . . . . . . . . . . . .
Depressed
Connects tube under
and connects low
test to an ac test
screen grid volt-
a
voltage.
age (if required)
to tube under test
Normal
Removes ac voltage
when pushbutton
from tube under
3-MUT. COND.
test.
a
is depressed.
8-METER REV. . . . .
Depressed
Reverses polarity of
Normal
Removes ac test
voltage applied to
voltage from diode
meter.
under test and
Normal
Permits normal po-
connects normal
larity of voltage
screen grid volt-
to be applied to
age (if required)
meter.
to tube under test
when pushbutton
a Voltage
will vary slightly, depending on LINE ADJUST setting.
3-MUT. COND.
is depressed.
c. Meter, Indicator Lamps, and Jacks.
3-MUT. COND. . . . .
Depressed Connects tube under
Note. The jacks on the TV-7A/U accommodate
test to plate and
5/64-inch diameter tip plugs; the jacks on all other
screen grid (when
models of the test set accommodate 3/32-inch diameter
required) volt-
tip plugs.
ages.
12
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