Control
Function
PLATE (12-position rotary
When set to one of positions 1 to 9, con-
switch).
nects plate voltage to correspondingly
numbered base pin of tube under test.
(0 is no connection.) In position A or
B, connects plate voltage to A or B
electrical clip.
When set to one of positions 1 to 9, con-
SCREEN (12-position rotary
nects screen voltage to correspondingly
switch).
numbered base pin of tube under test.
(0 is no connection.) In position A or
B, connects screen voltage to A or B
electrical clip.
When set to one of positions 1 to 9, con-
CATHODE (12-position rotary
nects desired test circuit to cathode of
switch).
tube under test through correspond-
ingly numbered base pin or, in position
A or B, connects through A or B elec-
trical clip.
When set to one of positions 1 to 9, con-
SUPPRESSOR (12-position rotary
nects desired test circuit to suppressor
switch).
grid of tube under test through cor-
respondingly numbered base pin or, in
position A or B, through A or B elec-
trical clip.
Selects proper filament voltage between
FILAMENT RANGE (20-position
OFF (0-volt) and 117 (117 volts ac).
rotary switch).
Permits fine adjustment of filament volt-
FILAMENT fine control ------------
age applied to tube under test.
Selects 5, 10, or 50 volts fixed bias, or
BIAS RANGE (8-position rotary
connects biasing resistors as required
switch).
when in positions A, B, C, D, or E.
Permits fine adjustment of bias voltage.
BIAS fine control ------------------
When in positions G, H, J, K, M, N, P,
PLATE-SCREEN RANGE (12-
Q, R, or S, connects the proper plate
position rotary switch).
and screen grid voltage to be used in
the test circuit. (OFF is no connec-
tion.)
Permits fine adjustment of plate voltage.
PLATE fine control------------
Permits fine adjustment of screen grid
SCREEN fine control ---------------
voltage.
Switch
GM-SIGNAL RANGE (6-position
position
Action
A through E-- Connects proper ac sig-
rotary switch).
nal voltage to grid of
the tube under test.
F - - - - - - - - - - - - - Removes signal voltage
from grid of tube un-
der test to permit cali-
bration of PERCENT
Q U A L I T Y meter for
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