Figure 1. Antiparasitic ferrite beads (used on TV-2B/U and TV-2C/U), typical
application.
Section Il. UNIT THEORY
a. Power Supply. The power supply consists
3. Block Diagram
of five supply voltage circuits.
(1) The filament supply provides 19 differ-
Test Set, Electron Tube TV-2(*)/U consists
ent filament voltages, that range from
of a power supply for the electrodes of the tube
0.625 to 117 volts alternating current
to be tested and seven tube-testing circuits.
(vat). FILAMENT VOLTS meter Ml
These are a transconductance (G,,,) test cir-
indicates the filament voltage supplied
cuit, an emission test circuit, a gas test circuit,
to the tube. Full-wave rectifier tube VI
a voltage-regulator tube test circuit, a filament
provides unfiltered, pulsating direct
continuity test circuit, a short test circuit, and
current (de) voltage for the plate of
a leakage test circuit. SELECTORS and
the tube under test. Full-wave recti-
RANGE switches permit application of proper
fier V3 furnishes filtered dc voltage for
test voltages to the tube under test. Indicating
the screen of the tube under test.
meters and an indication lamp display the test
results. The functional interrelation of the prin-
(2) P L A T E meter M5 and SCREEN
cipal circuits and parts of the tube tester is
VOLTS meter M6 indicate the plate
shown in the block diagram. A complete sche-
and screen voltages that are supplied
matic diagram is shown in figure 26.
to the tube under test.
4
AGO 1428A
