12. Tube Test Data
Tube test data in roll chart form is mounted in a case inside
the cover of Test Set, Electron Tube TV-2(*)/U (fig. 1). The
tube test data roll chart has left- and right-hand sections. The
tube types appear in ascending numerical and alphabetical order
from top to bottom in the left-hand section and from bottom to
top in the right-hand section. Designations on the tube test data
roll chart housing (fig. 4), which appear in duplicate over both
sections of the tube test data roll chart, indicate the tube type,
the switches and controls of the tube tester in the order in which
settings should be made, and the minimum acceptable percentage
o f rated transconductance as indicated on the PERCENT
QUALITY meter. The information necessary to set the switches
and controls for any tube type listed on the tube test data roll
chart appear directly below these column headings.
Column
Description
TUBE
TYPE-------------
Tubes that can be tested on the TV-
2(*)/U are listed in numerical and
alphabetical order.
TEST
---------------------
I n d i c a t e s type of test to be performed,
as follows:
EM-Emission
ER-Electron-ray indicator
GM-Transconductance
LK-Leakage
TH-Thyrathron
VR-Voltage regulator
I n d i c a t e s setting of FUNCTION switch,
FUNCTION--------------------
as follows:
L-Leakage
T-Test
VR-Voltage regulator
Indicates setting of each selector switch,
SELECTORS (L TO R) ------------
reading from left to right on the tube
tester, as follows:
FIL-
FIL+
GRID
PLATE
SCREEN
CATHODE
SUPPRESSOR
Indicates setting of range controls which
RANGE
-----------------------
correspond to following subcolumns:
FILAMENT
BIAS
PL.-SCR
GM.-SIG
