Airline 62-166 Schematic

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Product Information:
Model:62-166
Manufacturer:Airline (Montgomery Ward)
Description:Changes

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Schematics Content:

Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you.

Page 1:

RCA R-l0 DC

With the exception of the interlock,
the R-10 DC is identical with the R-7
and R>>9 DC chassis, shown on pages
RCA 2-8, 2-9 and 2-10 in Rider's Man-
ual, Volume II, pages 504-D-3 and 504-
D4 in the early issues and on pages
1772, 1773 and 1774 in the Rider-
RCA Combination Manual.

The RCA IIE-16 receiver employs the
standard R-7, R-9 AC Superette chassis
already listed in Rider's Manual. To
this chassis is added the phonograph
motor, pidrup and volume control.
Service information other than those re-
lating to replacement parts can be had
by referring to the service notes cover-
ing the Superette and the Radiola 86

lIn view of the absence of phonograph
pickup connection to the Superette reA
ceiver, the pickup leads in the RE-lo
are connected to terminals 1 and 2, the
Connecting link being removed. The
ground connection upon the shielded
lead is joined to terminal 4. The d-c.
resistance of the pickup coil is 4.5 ohms.
The pickup volume control is 60 ohms.
The input transformer is tapped and
the following values of d-c. resistance
apply. Between terminals 1 and 2, 3.2
ohms; between terminals 2 and 3, 150
ohms, and between terminals 3 and 4,
4500 ohms. The connections of the
pickup correspond with the data shown
for the RE 16-A receiver, shown on
pages RCA 4-19 and 4-20.

Crosley 5V2 and 5A3

The i-f. peak in these receivers is
181.5 kc. The alignment and servicing
procedure for the 5V2 is the same as
that for the 5V1, shown on pages Cros-
ley 5-21 and 5-22 in Rider's Manual,
Volume V. The circuit is substantially
the same except for the addition of a
2,000-ohrri resistor between the moving
arm of switch 48 and the terminal which
is a part of switch 48 and which con-
nects to the low end of the input coil
to the mixer portion of the 6A7. The
voltage for the 5V2 is the san-ie as that
for the 5V1, shown in Riders Manual.

Airline Model 62- | 66

The present production of these re-
ceivers differs from the early runs. In
the early models the plate circuit of the
75 triode, contained only the plate cou-
pling resistor of 150,000 ohms. In the

CHANGES PAGE 7-15

later models a plate filter resistor of
50,000 ohms was added. In addition a
.ZS-mfd. bypass condenser, which by-
passed this plate filter resistor, was also

In the early models the capacity range
of the trimmers used across the wind-
ings of the first i-f. transformer, was 150

The receiver

schematic appears upon page Majestic

5-42 and in the RCA-Rider Combina-
tion Manual on page 1254.

In some receivers the 250-ohm re-
sistor R-3 and the 2000-ohm resistor
R-11 were replaced by a 160-ohm and
a 2500-ohm resistor respectively. The
purpose of this was to make the G-
57A-S modulator tube oscillate more
readily. If a 250-ohm and a 2000-ohm
resistor are used in the receiver, it may
be necessary to try two or three different
tubes in this stage, when replacement
is being made, before a tube is found,
which will oscillate readily over the
entire frequency band. If trouble is ex-

perienced along this line, the changing ,

of either one or both of the resistors
mentioned should eliminate the diffi-

Condenser C-l7 will be found to
have a value of .05 mfd, in a number
of receivers; however, it should be re-
placed with a .1-mfd unit, as shown
in the schematic.

Silvertone |840. |842 Oscillator Plafe

In some instances, the 10,000-ohm
wire-wound resistor in the oscillator
plate circuit of the models 1840 and
1842 opens during operation. The cause
of the breakdown is mechanical, rather
than electrical. Apparently, the form on
which the resistance wire is wound ex-
pands sufficiently during operation to
break the wire. If this break occurs dur-
ing operation, a small arc occurs at the
point of open, making a burnt mark
upon the resistor and creating the 'im-
pression that the unit failed due to over-
load. As has been stated, such is not the
case. At any rate, replacement should be
made with a 10,000-ohm carbon resistor
rated at 2. watts and bearing part No.

Monlgomery-Ward Models bZ-IBS,
In the early models 6D6 and 42 glass
tubes were used. These have been reA
placed by the metal tubes, 6K7 and 6F6

Any trouble due to hum in these
models can be eliminated by performing
the following operations, the purpose
being to add an additional section of
filtering to the power supply.

Enlarge the hole in the chassis near
the power transformer to about 0.25
inch diameter, as indicated in the illus-

Remove the cover of the power trans-
former. To do this, it is first necessary
to remove the four nuts on the under
side of the chassis and then to unscrew
the bolts that pass through the lamina-
tions. The tone control and switch will
have to be dismounted in order to get
at one of the transformer's nuts.

Mount a Part No. R1079515 choke on
top of the power transformer in place
of the original transformer covet. Be
sure ro mount the choke so that its
leads can come down through the
enlarged hole in the chassis. Also be
sure to tighten the bolts well, in order

Changer to be made in Silvertone Medals
to prevent hum. Then remounr the
transformer and choke assembly on the
chassis and remount the tone control.

Make the wiring changes indicated in
the illustration. The dotted lines rep-
resent the original wiring, which is to
be changed and the solid lines show the
new connections. Note that a new part,
a 2-mf., AMO-volt, dry electrolytic con-

See page 4-22 of Rider's Manual for
schematic diagram.

Sporlon Models 6|, 62

A 50-ohm, 2-watt resistor, Part No.
B-6061-1, has been added in series with
the plate lead of"the 25Z5 that is drawn
nearest the speaker field in the schematic
diagram, shown on Sparton page 4-11
in Rider's Volume IV. This resistor
protects the 25Z5 tube against voltage

It is advisable to put this resistor in
any Models 61 and 62 not so equipped
that you may service.

(C)John F. Rider, Publisher

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