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RADIO
TELEVISION
New TV Service Guide, Vol. 4
The new TV Service Guide Volume
4 is now available from General Elec-
tric tube distributors. This volume
covers from 1958 to 1960 and in-
cludes M4, M5, M6, U3, U4 and U5
series receivers.
Similar to Volumes 1, 2, and 3,
Volume 4 includes such features as
a photo index for quick set indenti-
fication;
schematic
diagrams
of
chassis, VHF and UHF tuners; a
complete replacement parts list; elec-
trical components and main chassis
diagrams describing tube and trim-
mer locations and VHF and UHF
tuner photos with component loca-
tions clearly indicated.
All four volumes are available from
G-E tube distributors. If your dis-
c>
tributor is unable to supply you, use
order coupon on this page.
New Radio Service Guide
r • '
RADIO
The 1946 to 1961 Radio Service
Guide combines all the information
of earlier volumes, and updates the
coverage to 1961. In addition, photos
of every model listed have been add-
ed. Here's what this convenient, one-
step reference source will mean to
you in your service shop:
• Quick, easy identification of un-
known models from photos
• Complete schematic diagrams for
all post-war models
• Alignment procedures outlined
• Complete parts lists with parts
description,
and
G-E
catalog
number
Ask
your
G-E
Distributor
for
ETR-2975 or use handy order coupon
on this page.
ORDER COUPON
General Electric Company
Department " B"
3800 N. Milwaukee Ave.
Chicago 41, Illinois
Enclosed is money order or check payable to General Electric Company for:
Quantity
ETR-2790
Soldering Iron Holder
ETR-2791
Vinyl Electric Tape and
Dispenser
ETR-1765
Volume 1 TV Service Guide
Years 1946-1953
ETR-1766
Volume 2 TV Service Guide
Years 1953-1955
ETR-1767
Volume 3 TV Service Guide
Years 1955-1957
ETR-2892
Volume 4 TV Service Guide
Years 1958-1960
ETR-2975
Volume 3 Radio Service Guide
Years 1946-1961
ETR-2000
TECHNI-TALK Binder
(with tabbed dividers for
Tele- Clues and Tele- Clue
Schematics)
ETR-2579
Complete Set of TECHNI-
TALK back issues Vol. 1,
thru Vol, 13, No. 5
(Includes all Tele- Clues
and Tele- Clues Schematics)
ETR-1095-A
Binder with Tele- Clues and
Tele- Clue Schematics
Price
$1.10
$ .49
$2.50
$2.50
$2.50
$3.00
$1.95
$2.00
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$3.50
Name
Street Address
City, Zone No. and State
(Please Print)
If you are receiving more than one copy of TECHNI-TALK, please cut out the order coupon
with your address on the other side. Mark " Duplicate
-
and mail to Editor, TECHNI-TALK, Gen-
eral Electric Co., Owensboro, Ky.
G- E Sonic Remote
Control System I
Continued from Page I
limiting
protection
resistor
while
R752 provides emitter stabilization
for TR752.
A standard 8.4V transistor radio
battery provides power for the trans-
mitter. A total drain of 22 ma is
the normal load with about 15 ma
being used by the output section.
One indication of no oscillation is
low battery drain, when measured
by a low scale milliammeter.
The
transducer
employed
is
a
ceramic type similiar to that used in
ceramic
cartridges.
Each
unit
is
tuned to 40.0 KC for best output.
Close examination of this unit will
show that the transducer employed
by the transmitter is identical to
that used in the receiver except for
physical size of the case and the
fact that the unit used in the trans-
mitter is wired and soldered into the
circuit while the receiver unit has a
phono
socket
for
plug-in
connec-
tion.
A voltage impressed between the
two
silvered
surfaces
causes
the
wafer to bend and when this voltage
is part of an AC waveform the unit
vibrates at the desired frequency.
When used as a pick up, the reverse
is true; that is, the mechanical vi-
brations cause a voltage to be pro-
duced across the two silvered sur-
faces.
L771
77A.
• Mt..
71'17-003
X771
CTROSOXIE
5772
VOLUME
STEPPING
R- VOLTAGE ARIES AIN INPUT
APED/AGE or SCOPE
Fig. 4 Schematic diagram of electrostatic
transducer transmitter used in
Sonic Remote Control System
A second type transmitter is also
used in some " M 6" receivers. Basic-
ally the operation of this unit, shown
schematically in Fig. 4, is the same
as Fig. 3. The principal differences
include the use of a single transistor
and
an
electrostatic
transducer.
Since the voltage output of the elec-
trostatic transducer is higher the
amplification provided by the second
transistor is not required.
One extra note on service to be
emphasized is that often low range
is a direct indication of a weak bat-
tery. Alignment for the transmitter
will be covered in a* later issue.
The Sonic Remote Receiver will
be described in the next issue.
9
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