User's Manual

Control
PLATE (12-position rotary
switch).
SCREEN (12-position rotary
switch).
CATHODE (12-position rotary
switch).
SUPPRESSOR (12-position rotary
switch).
FILAMENT RANGE (20-position
rotary switch).
FILAMENT fine control ------------
BIAS RANGE (8-position rotary
switch).
BIAS fine control ------------------
PLATE-SCREEN RANGE (12-
position rotary switch).
PLATE fine control------------
SCREEN fine control ---------------
GM-SIGNAL RANGE (6-position
rotary switch).
Function
When set to one of positions 1 to 9, con-
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-
nects screen voltage to correspondingly
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-
nects desired test circuit to cathode of
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-
nects desired test circuit to suppressor
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
OFF (0-volt) and 117 (117 volts ac).
Permits fine adjustment of filament volt-
age applied to tube under test.
Selects 5, 10, or 50 volts fixed bias, or
connects biasing resistors as required
when in positions A, B, C, D, or E.
Permits fine adjustment of bias voltage.
When in positions G, H, J, K, M, N, P,
Q, R, or S, connects the proper plate
and screen grid voltage to be used in
the test circuit. (OFF is no connec-
tion.)
Permits fine adjustment of plate voltage.
Permits fine adjustment of screen grid
voltage.
Switch
position Action
A through E-- Connects proper ac sig-
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
QUALITY meter for
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