Bendix Radio Div. 0526 Schematic

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Product Information:
Model:0526
Manufacturer:Bendix Radio Div.

Schematics Content:

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Page 1:

BENDlx PAGE 20-1

MODELS 0526, 526A?

AC-DC SUPERHETERODYNE RADIO RECEIVER

GENERAL

The Bendix Radio Models 0526 and 526 in-
corporate two similar chassis designated as 0-1
and R-l. They are both AC-DC operated, 5 tube,
superheterodyne receivers providing reception
of the Standard Broadcast Band. A high im-
pedance loop antenna is installed on the hack
of the chassis. An outside antenna may'be con-
nected to Ithe terminal, marked EXTERNAL
F ANTENNA, on the bottom of Models 526A and
526B and on the rear of Models 526C and 526E.
The tuning gang is isolated from the chassis

and carries AVC. Care must be exercised so Fig' 1
that it is not grounded at any time. The Models MOdel 526A Brown Plastic
shown in Fig. 1 and Fig. 2 use both the 0-1 Model 5268 Ivory plastic

and R-l chassis, but only the 0-1 chassis is
employed in Model 526E (see Fig. 3).

SPECIFICATIONS

Power Requirements
105 - 125 Volts, 60 cycles AC
105 - 125 Volts DC

Power Consumption

30 Watts . v

Tuning Frequency Range I
'0526 _ 540-1700KC Fig 2

Intermediate Frequency - 455KC Model 526C Black &

Power Output Green Catalin l

Maximum - 1.88 Watts
Tube Complement - 5 Tubes
Tuning Drive Ratio - 14:1
Pointer Travel - 4 Inches
Loudspeaker
4" Diameter PM
Voice Coil Impedance ~ 3.2 ohms @ 400 CPS

CABINET COMPONENTS FOR 05266 lr 5166 Fig. 3
Model 526E Walnut
0101103 BUMPER-Kumar, Cablner x x CABINET COMPONENTS FOR 0526E

Gf0S00 GASKET-Felt, Speaker
1001401 INDIEATOII-Melal Dial Painter
KC0600 KNDB-Ermlrnl, Green
XSOC00 STRIP-Dlal Cord Prolemr

1100800 KNUB-EoMrol, Mmled Brown

XSUE00 SHIP-01:1 Cord Prolector

(C)John F. Rider

Page 2:

PAGE 20-2 BENDIX

MODELS 0526, 526A,

Connect line cord plug to 117 volt AC power
source and allow receiver and test equipment
to warm up for at least five minutes. Set Volume
control at maximum and connect output meter
across voice coil. (If a DC VTVM is available
it may be more convenient to connect from
tuning gang stator to chassis ground. thus
using AVC voltage to indicate circuit resonance.
Volume can then be kept low, no modulated
signal is needed, and a steadier indication on
the meter is obtained.) Make all adjustments
in order given in table and tune for maximum
output. Keep input as low as possible at all

For the 0-1 chassis, pre-set dial pointer with
gang condenser fully counterclockwise by slid-
ing pointer on dial cord until it is exactly 2
inches from left end of dial back plate. Refer to
alignment chart and to diagram of Dial Refer-
ence Points, Fig. 4, for proper input signals
and their corresponding reference points.

On the R-l chassis dial settings and fre-
quency check points are indicated on the dial

PRELIMINARY ALIGNMENT PROCEDURE

PRECAUTIONS

An isolating transformer should be used be-
tween the power supply and the receiver if any
of the test equipment is AC operated. The use
of isolating capacitors is not recommended as
AC through the capacitor may introduce hum
modulation, and if the capacitors should break
down, the test instruments are likely to be

REFERENCE

POINT

Fig. ? Dial Refermlre Points

back plate. 0-1 Chassis
ALIGNMENT CHART
Generator Generator Circuit Dial Adjust Remarks
Frequency Coupling Aligned Setting
1) 455KC Through 2nd 1F Maximum C6a. Adjust for
.05 mfd to C6b Maximum output
to right
antenna
2) 1475KC " lst IF 5%" C3a, ' Adjust for
(See C3b Maximum output
3) 1475KC " RF 5%" Clb. Adjust for
(See C10 Maximum output

4) REPEAT STEP 3 SEVERAL TIMES T0 INSURE MAXIMUM OUTPUT

5) 965KC Through 4%" 'Check 4
v .05 mfd (See Calibration
antenna
(See Calibration

' If calibration is of? more than 10KC bend plates_o_f gang condenser.
should be attempted only by experienced technicians.

This is a very delicate operation and

o John F.

Rider

Page 3:

BENDIX Ppgi 20-3
MODELS 0526, 526A,

TUNING ovoLUz';
MI2 SPEAKER

AC LINE CORD

NOTE: In the 0-1 chassis the positions of the electrolytic capacitor (C13a,b) and 2nd IF transformer (T2)
are reversed.

Where trimmer: have been removed from gang, the RF trimmer will be found on the lntennl, the
oscillntor trimmer on the side of the chassis.

Fig. 5 Tnmmer Location Diagram

SPEAKER

Fig. 7 Front Panel Controls

Figure 7 shows Front Panel Controls for
526A dz B Models. On all 0526 Models the
Frequency Range is 540~l700KC, but other-

,__ .X wise the Controls are similnr.

L\ AC LINE GORD

Fig. 6 Component Diagram
Bottom View

(C)John F. Rider

Page 4:

PAGE 20-4 BENDIX

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(C)John F. Rider

Page 5:

BENDIX PAGE 20-5

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Rider

Page 6:

PAGE 20-6 BENDIX

MODELS 0526, 5261,
REPLACEMENT PARTS LIST
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Q John

F. Rider

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