Section Il. UNIT THEORY

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.

AGO 1428A