CHAPTER 1 THEORY - TM-11-6625-274-350013

THEORY

GENERAL

Section I.

Note. For applicable forms and records, see para-

1. Scope

graph 2, TM 11-6625-274-12

a. This manual covers field and depot main-

tenance for Test Sets, Electron Tube TV-7/U,

2. Internal Differences in Models

T V - 7 A / U , TV-7B/U, and TV-7D/U. It in-

a. An antiparasitic bead' (fig. 1) made of

eludes instructions appropriate to fourth and

ferrite is placed on the lead soldered to terminal

fifth echelons for troubleshooting, testing, cali-

5 of tube test socket X105 and on the lead

brating, and repairing the equipment; and lists

soldered to terminal 2 of tube test socket X106

the tools, materials, and test equipment re-

in the TV-7B/U. Antiparasitic beads are also

quired for fourth and fifth echelon mainte-

placed on the leads soldered to all tube test

nance. Detailed functions of the equipment are

sockets of the TV-7D/U, except on the sockets

covered in paragraphs 3 through 12.

and the terminals listed below.

b. The complete technical manual for this

equipment includes three other publications:

(1)

Tube test sockets X109 and X110.

TM 11-6625-274-12, TM 11-6625-274-12P, and

(2)

Pins 1 and 4 of tube test socket X103.

TM 11-6625-274-35P.

(3)

Pins 1 and 4 of tube test socket X105.

c. Forward comments concerning this man-

(4)

Pin 8 of tube test socket X111.

ual to the Commanding Officer, U. S. Army Sig-

b. Other internal differences are listed in

nal Materiel Support Agency, ATTN: Publica-

the chart below. For external differences, see

tions Engineering Department, Fort Mon-

mouth, N. J.

TM 11-6625-274-12.

*The value of resistors R131 and R132 (if used), which ranges from 10,000 10 20,000 ohms, is determined in production.