User's Manual

Control
Function
SIGNAL-VR control---------------------
Quality SHUNT control --------------
GM CENTERING control ------------
b. Indicators.
Indicator
PERCENT QUALITY meter -------
FILAMENT VOLTS meter ----------
GRID BIAS VOLTS meter -----------
PLATE meter --------------------------
SCREEN VOLTS meter -------------
SIGNAL meter -------------------------
PILOT lamp ------------------------
FIL. CONT. SHORT lamp -------
Note. On some equipments this lamp is
marked SHORT.
Switch
position Action
performance of trans-
conductance (GM)
test.
Permits accurate adjustment of ac signal
level (indicated on the SIGNAL
meter).
In test of voltage-regulator
tubes, permits adjustment of maxi-
mum and minimum currents through
the tube (indicated on the PLATE
meter).
When set to the position specified on the
tube test data roll chart, shunts PER-
CENT QUALITY meter with proper
resistance to perform quality (GM)
test.
With GM-SIGNAL RANGE switch in
position F and the quality SHUNT
control set in accordance with tube
test data, permits zero calibration of
the PERCENT QUALITY meter for
transconductance (GM) test.
Function
Indicates transconductance of amplifier
tube under test.
Indicates ac filament voltage supplied to
tube under test.
Indicates grid-bias voltage supplied to
tube under test.
Indicates plate voltage supplied to tube
under test.
Indicates screen grid voltage supplied to
tube under test.
Indicates ac signal level supplied to tube
under test.
Glows when tube tester is connected to
ac power source and power ON-OFF
switch is in ON position.
Glows to indicate short-circuited ele-
ments or filament continuity in tube
under test.
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