receptacle on the panel (fig. 1) and unwind the power cord from
the brackets.
d. Check to see that all controls and switches are in their
power cord safety positions as follows:
Switch or control
Safety position
OFF.
ON-OFF ----------------------------------------
OPER.
SHORT TEST ----------------------------------
TEST.
FUNCTION -------------------------------
Neutral
PRESS TO TEST P1, P2, P3, P4,
P5, and P6.
0.
FIL and FIL+ ----------------------------
0.
GRID --------------------------------------------
0.
PLATE -----------------------------------------
0.
SCREEN -----------------------------------------
0.
CATHODE -------------------------------------
0.
SUPPRESSOR ----------------------------------
OFF.
FILAMENT RANGE ------------------------
Extreme counterclockwise.
FILAMENT fine control ---------------------
50.
BIAS RANGE --------------------------------
Extreme counterclockwise.
BIAS fine control --------------------------
OFF.
PLATE-SCREEN RANGE -------------------
Extreme counterclockwise.
PLATE fine control ---------------------
Extreme counterclockwise.
SCREEN fine control ---------------------
Extreme counterclockwise.
SIGNAL-VR fine control --------------------
F.
GM-SIGNAL RANGE ----------------------------------
0.
SHUNT control -------------------------------
Midposition (as shown by alinement of
GM CENTERING control ------------------------
dot on knob with that on panel).
e. Condensed operating instructions are mounted inside the
cover of the tube tester (fig. 1). Revise the condensed operating
instructions for GM TESTING to read as follows:
(1) Perform all operations listed in I through IV.
(2) Depress P4 and reset controls as shown on tube test data
roll chart.
(3) Release P4, set GM-SIGNAL RANGE control to F, and
depress P4.
(4) Set PERCENT QUALITY meter to 0 with GM CEN-
TERING control.
(5) Release P4 and return GM-SIGNAL RANGE control to
tube test data roll chart listing.
(6) Depress P4; if PERCENT QUALITY meter reading is
above value in MIN LIM column, tube is good. Release
P4.
f. Insert the power cord plug into the ac outlet.
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