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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.

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