Bendix Radio Div. 95B4 Schematic

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Product Information:
Model:95B4
Manufacturer:Bendix Radio Div.

Schematics Content:

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Page 1:

SPECIFICATIONS
Power Requirements
105-120 Volts 60 cycle AC
Power Consumption
25 Watts
Tuning Frequency Range
Intermediate Frequency
Power Output
Maximum -- 8 Watts
Tube Complement
6K6GT, and Rectiher 5Y3--Total 9
Tubes
Loudspeaker -- 12" PM
Record Changer
Automatic, for twelve 10-inch or
ten 12-inch standard lateral cut
records. Plug-in receptacle on
rear cover for use of Long Play-
ing record player.
Overall Dimensions
Model Height Width Depth

BENDIX PAGE 20-31

MODELS 95133, 9 B3 Rev., 95151;, 95113,

95M9 - Mahogany

y Fig. 1 ~ Models 95M3, 9583 and 95M9

GENERAL

Bendix Radio Models 95MB, 9583,-and
95M9 employ nine tubes including a
rectiher to provide rece tion of the
FM and AM standard bros cast bands.
Two individual chassis are used in
each of these radio receivers. The
power supply and the push-pull audio
output circuit are found on the smaller
chassis. The FM section of this re-
ceiver contains a tuned RF stage of
amplihcation which has the plate volt-
age removed from its tube when the
hand switch is in any but the FM po-
sition. Built-in AM and FM antennas
are attached to the cabinet. A ower
supply of 105-120 volts 60 cyc e AC
is required for theoperation ofthese
radio receivers. The multi-purpose
6T8 tube combines the functions of AM
demodulator, FM detector, and Brst
audio ampliher in one envelope. The
12AT7, a double triode, is used as a
mixer-oscillator tube; and push-pull
audio output isprovided b two 6K6GT
tubes. A plug on the cabinet back

Shipping Weight

cover provides for the use of Long
Playing record players. The switch
associated with this plug onthe back
cover isused to connect to the radio

MDdel 95M3 88 lbs' chassis either the standard record
Model 9553 88 1bs- player installed in the cabinet or a
Model 95M9 85 lbs- separate Long Playing record player.

(C)John F. Rider

Page 2:

PAGE 20-32 BENDIX

MODELS 95B3, 9583 Rev-, 95Bu, 95MB,

PRECAUTlON NOTES
Hum may be introduced if the leads
connected to switch, SZ, on the
volume control aredressed toward the
base of 12AT7 tube. The leads should
be pushed directly against the side
of the chassis to a point approxi-
mately half an inch from the bottom
edge of the chassis and adjacent to
the'volume control andthen led along
the sides of the chassis to plug J2.
The capacitor, C28, should be
dressed under R18 with the ca acitor
leads as short as possih e. ln
addition, the Element lead of V2,
12AT7, should be as short as possible
and connected directly between pin 9
of V2 and the terminal board.
Oscillation may occur if the AM
oscillator coil (L2) is not positioned

The AM section should be aligned
before the FM section because of
possible interaction between the

ALIGNMENT

correctly. The recommended spacing is:
9/16" between osc. coil and front
3/4" between csc.
1/2" between osc.
main chassis.

coil and bottom

coil and end of

rnrnurmv savannas

suntan

OFF VOL. PH. AM. FM.

.Fig. 2 - Control Diagram

TUNE TONE

PROCEDURE

replaced in the cabinet.

TEST EQUIPMENT REQUIRED
Signal Generator

coils in the chans. Before attempt-
ing to align set allow receiver and
test equipment to warm up for at
least Hve minutes.Whenever possible,
have a speaker connected to the out-
put and use a30% amplitude modulated
signal in order to identify weak
T signals in apoorly tuned set. It may
be necessary toadjust the FM antenna metallic material

trimmer slightly when the chassis is Standard Output Meter

AM ALIGNMENT

PRELIMINARY PROCEDURE: 'ith gang condenser closed, sstdisl pointer to coincide with reference
point etched into dial back plate. See Pig. 4. Place band switch in AH position and use a 305

modulated signal throughout. Connect an output meter acrossvoics coil. Adjust Antenna Trimmer
C2b again after chassis is installed in the cabinet

Vacuum Tube Voltmeter I
(ground or minus must be iso-
lated from power line)
Capacitors, .01 mfd and 100 mmf
Alignment Screwdrivers made
from a high dielectric, non-

GENERATOR GENERATOR DUMMY SPECIAL DIAL
FREQUENCY COUPLING ANTENNA CONDITIDNS SETTING ADJUSTMENTS REMARKS
l. 455 KC All High Side" .01 mfd Short All Osc. Gang con- Top Slug of Adjust for msx~
Term. #5 capacitor Term. #I to denser 11,11." and imum outputh'
gang cond. chassis fully bottom slug post several
Low side-- ground open of T4 times to insurs
chassis maximum output
I ground
2. 147SKCAM High side" 100 mmf Remove short 1475 KC 617 Rock Tuning
Term. #3 capacitor from Oac. Ref. mark Control while
gang cond. Term #1 adjusting for
Low side-- maximum output
chassis
ground
a. 965 xc As " " oss rc ' check "u-
Ref. mark bration
4. 580 KC Al " " 580 KC ' Check cali-
Ref. mark brstion

* If calibration does not check within tolerances denoted by etched lines on dial backplate,

oscillator gang rotor plates must be bent to obtain proper calibration. This operation is
very delicate and should be attempted only by properly trained ersonnal-

o John F. Rider

Page 3:

BENDlx PAGE 20-33

MODELS 95153 Rev., 9531+, 95m Rev.:I

FM ALIGNMENT 95m,95M9Rev.
cw METER METHOD

Preliminary Alignment Procedure: lith gang condenser fully closed, adjust dial pointer to
coincide with the reference mark etched into dial back plate. Bee Fig. 4. Place band switch
in FII position. Use 305 amplitude modulated signals when possipie.

iNERATOR DMN GENERATOR SPECIAL DIAL V VTVM
FREQUENCY ANTENNA WUPLING CWDITIONS SETTING CONNECTNNS ADJUSTMENTS REMARKS

l. 10-1 E .0| lfd High aide" Bhort FII Osc- Gang conV `Head to Bottom slug Adjust for max-

Al or Cl Capacitor Term. #4 Term. #2 of denser chaasla of Tl. T2, imum AVC read-
Gang Cond. Gang Cond. to fully ground Top slug of ing on VWNJZe-
Low side- chassis open -Lead to T3 peat adjustment
chassis ground Pin 2 of several times
ground tube 618 to insure max-
imum reading
2. Relovo Remove Short Fil Ole, " Center tap Adjust VNU While con-
Signal Signal htm. #2 of of 100K for Zero nected to cha-
Generator Generator gang cond. to resistor sis. the VTVll
comon ground and Term. is adjusted by
ho 100! #6 of its aero
matched ro- seitch SlC centering con-

series con-
nected between
Pin 2 of tube
618 a chassis

ground
3. 10.7 ll: .Ol ilid High aide-- " " " lott iu Ad' t b tt
AI or ?1 capacitor term #e1 of of 'Igl- I I slu:.to groin
Gang cond. dune xero l
Low eide-- reading on

4. Repeat Steps l. 2. and 3 until adjustment in Step l does not require a readjustnent to produce a
sero reading on the VTVII in Step 3-

5. 106 E FliDu-ly lil Dulw Remove short 106 IC 1Plead to Osc. trimmer Rock tuning

Antenna Antenna from Term." Ref. mark chassis C! then RF. control when

(Sea iig. Terminals of gang cond. ground C2: a Ant. . adjusting C3

| a) (see r1|. Resovs :out -iead to ca. fer r.rimum
3) Resistors Pin 2 of AC reading.

tube GT! then adjust

C21: and Cie

for maximum T

6. 97 l: " I 91 I: l T Check cali-
Al or Cl Ref. mark brstion

1. 9? m " " 90 m " T Check cali-
Al or C' Ref. mark bration

foscillator operates on high frequency side ol incoming signal but it ie possible to adjust
to the low aide. Set Signal Generator to 84.6 iKI (with receiver set to 106 IC); i( signal is i
heard. readiuat oscillator trimmer st signal generator frequency of 106 il: and check again at
".6 K. lignal should not be heard. _

T If calibration is not within reference mark at these points, the inductance of the Pl
oscillator coil must be adjusted. If dial pointer reading is on low frequency side, inductance
oi oscillator coil is too low and turns of coil must be compressed slightly. If pointer read-
ing is on high frequency side. the coil induetanee is too high and coil turns must be spread
slightly. Repeat steps 5, 6, and 1 until correct caiibration ia obtained.

To adjust l! coil, tune receiver to 90 K and observe AVC reading. Insert into lr coil, the
iron core ol tuning wand (rod of inauiating material one end of which contains iron core
slug and the other and contains a non-ferrous metallic slug). If reading increa , the in-
ductanee of coil is too lov and turns must be spread alightly. I( reading decreases. insert
opposite and (non-ferrous) of tuning wand into RF coil. lnductance of coil ie too low if
reading increases and turns must be compressed s1||h?1y. Correct adiuetment il obtained when
insertion of either end of tuning eaussa the reading to decrease.

The antenna coil inductance is adjusted in the same manner as the RF coil.

unrA-_| 30? o u 'w "nofsmt-aNTENua TERMINAL Yi. i i
DUMMY ANTENNA
Fig' 3 _ FM Dum-y Antenna _ _ fig. 4-- Dial-_Reference Paints

o John F. Rider

Page 4:

PAGE 20-34 BENDlx T _

The ratio detector inthe FM section
of this radio receiver can be aligned
very accurately by Visual Alignment.
This method can be used in conjunc-
tion with the CW method by following
the procedure outlined below.

1. Perform Step 1 indicited in CW
Meter Method Chart.

2. Set Signal Generator to 10.7 MC,
FM, with sweep width at maximum'pos-
Connect output of generator to ter-
minal #4 ofgang condenser and ground.

3. Connect vertical input ofcathode
ray oscilloscope to terminal #6 of
switch SIC and 'ground'; place a 60
cycle sine wave signal to horizontal
input if oscilloscope does not have
an internal 60 cycle sweep.

Fig. 5 - S Curves

4. Adjust signal generator frequency
until 'S' curve (Fig. 5) is centered
on the horizontal sweep. Curve may be
reversed because of internal circuit
of oscilloscope. Fig. 5b indicates
when 'Phase Control' of oscilloscope
is incorrectly adjusted.

4 TURNS

Fig. 6 - Dial Stringing Diagram

(C)John F. Rider

5. Adjust primary of T3 (top slug)
and secondary (bottom slug) for max-
imum desired 'S' curve. A VTVM can he
very useful at this point if con-
nected to pin 2 of tube 6TH and
ground. The oscilloscope will then
indicate the most linear curve and
the VTVM will indicate the maximum

6. Adjust bottom slugs of T1 and T2
and then repeat step 5 to insure
correct alignment.

7. Continue at this point, with the
alignment procedure starting with
step 5 as outlined in the FM CW Meter

_ IEE? new

Fig. 7 - Trisser Location

FM ANTENNA

The FM antenna used in Models 9SM3,
9583, snd 95M9 will not be found in
the Replacement Parts List since the
servicemen, by following the speciH-
cations in the drawing below, can
very easily and inexpensively make
the antenna himself.

Fig. 8 - FM Antenna

Page 5:

PAGE 20-36 BENDIX

(C)John F. Rider

MODELS 95133, 35133 Rev. , 95154, 95MB, I
REPLACEMENT PARTS LIST
Stock Stock
Ilo. Symbol (lo. Description Fo. Symbol No. Descrtfation
ELECTRICAL COMPONENTS ELECTRICAL CWPOIIEIITS (CONT'D)
mf 500V RCZZAZZIM RIS RESISTOR-COMP-ZZO ohms
500V RCZZAIOZM R|7,37 RESISTOR-Como- |000 ohms
43,55 Min. Value 500V R023A22IM RIB RESISTOR-CM'IP. 220 ohms
009ml 08,2|,29 CAPACITOR-Ceramlc 470 mf R022A330M R20 RESISTOR-Como. 33 ohm
Mln. Value 500V l/IIH
I 008823 CIO CAPACITOR-Ceramlc I2 mf R022A475M R28, 42 RESISTOR-Como. 4-7 meg
i 0T|A20 CI7 CAPACITOR-Trllmler 4-40 mf R025A39IK R33 RESISTOR~0WID. 390 ohm
28,30,3I, 450V R023AI5UI R34 RESISTOR-COMD. IE ohms
56 MIN R35,36 RESISTOR-Hirovound 750-
0P4T36 022,24,52, CAPACITOR-Paoer .03 mfd 750 ohms 3U
400V R022AZ45| R52 RESISTOR-Como. 2.4 neg
600V ALOZIB LI ANTENNA-AM Loop
300Vv LAOFOI L5 COIL-FM Antenna
l LFOCOO 054 CAPACITOR-Seo Coll L10 LFOAOI L6,7 COIL-RF Choke (PIate)
CE3A03 057a,b,c CAPACITOR-Electrolytic LFOAOO L8,9 COIL-RF Choke (FIIamnt)
20-20-40 mfd 450V LF0000 LI |1054 COIL-RF Choke
meg I/3II 3 Positlon

Page 6:

BENDiX PAGE 20-37

(C)John F. Rider

REPLACEMENT PARTS LIST (Cont'd)
` Stock - Stock
ELECTRICAL COMPONENTS (CONT'D) l/ECNANICAL COMPONENTS (CONT'D)
RVIlSili SZ SWITCH-Volume Control $09M00 SOCKET?9 Prong Miniature
See R26 SOBSOI SOCKET-Octal (Bottom Mtg.)
SSICOZ 53 SWITCH-Tone Slide 2 CABINET COMPONENTS.
Pole, 3 Position AMOL09 ASSEMBLY-Drop Front Lever
#IW OIAL LIGHT BTSTOO BOARD-Terminal 3 Screw Lugs
MECHANICAL COMPONENTS BZOBIS BACK-Upper Cabinet cover
BTISCS BOARD-Terminal l Lug I Mtg. Model 95MB
BT2505 BOARD-Terminal 2 Lug | Mtg. BZOBI9 BACK-Lower Cabinet Cover
BTSSOC BOARD-Terminal 3 Lug lMtg. Model 95MS
BTIISOG BOARD-Terminal li Lug IMtg. 810820 BACK-UDP" Cabinet Cover
BT6502 BOARD-Terminal 6 Lug ZMtg. Model 9553
BTSSCO BOARD-Terminal 8 Lug ZMtg. BZOBZZ BACK-Lower Cabinet Cover
CDONOI CABLE-Dial Tuning Model 9583
CLOAOO J2 CABLE-Pwer, Nith Re- 810823 BACK-Upper Cabinet Cover
ceptacle Model 95M9
CLZAOB CORD-AC Brown BZOBZII' BACK-Lower Cabinet Cover
GROSOS GROYMET-Top RF Sub-chassis Model 9849
Rubber Shockmount BZODIIO BOARD-Baffle Mel 9949
GROSIB GROMMET-Rear RF Sub-chassis BZODIH BOARD-Bafer Models BEMS l
Rubber Shockmount 9533
NBOM7II BRACKET-indicator Slide Rail 810042 BOARD-Bafer (Cardboard l
NBOM83 BRACKET-Dial Light Cloth) Model 95M9
HBOMBII BRACKET-Dial Back Plate CLIDOI Jil CABLE-Phono Connector L
HCOCC9 CLIP-Foner Supply Cable Plug (Switch to Chassis)
NCONOS CLAMP-Tube Shield Base CLIDOZ JI CABIL-Phono Connector C
(I-I/B" Mtg. Dim.) Receptacle (Switch to
NCOSOO CLIP-Spring Tuning Shaft Phono Lead)
NCOSSO CLIP-IF Can Mtg. 080C09 DIAL-Scale AM-FM
H0056? CLIP-Trimer Spring EDOPOO ESCUTCHEON-Plastic Dial L
NCOTOI CLAMP-Tube Control
NPOPII PIN-Chassis Shockmount GROSIB GROMIET-Shockmount for
NRCSOZ RIVET-Shoulder .2|8 x .083 Chassis
i HSOC75 SPRING-Dial Cord GZOBOC BAR-Vertical, End (Grille)
IISOCBS SPRING-Tension Models 95MG & 9583
F NSOFIS SLEEVE-RF Sub-chassis GZOBOI BAR-Vertical, Center
Shockmount Mtg. (Grille) Models 95K) l
Shockmount 610802 BAR-Horizontal, End
IDOMZI INDICATOR-Metal Pointer (Grille) Models 96m A
8| Carriage 9583
JPOSOO J2 PLUG-Ii Contact 010803 BAR-Horizontal, Center
JR200I JS RECEPTACIf-Z Contact Phono (Grille) Modela 95MB L
i Power asaa
JRZOIZ J6 RECEPTACLE-Z Contact FM Ant. 610008 GRILLE-Cloth Model 9583
JRISOO J'l RECEPTACLE-I Contact Phono 010C09 GRILLE-Cloth Model 95m
MBOBOO BEARING-Tuning Shaft Brass GZOMZB GRILII-Metal Model 95M9
MLOCCII LEVER i BUSHING-Tone Control HBOMBB BRACKET-Rear Chassis
MPO|00 PULLEY-Idler Fiber Shockmount
YSOTIB SHAFT-Tuning IIBOM89 BRACKET-Front Chassis
P80006 PLATE-Dial Back Shockmount
PIOPOI PLATE-Line Cord ineuletor NBOMSO BRACKET-Cabinet Mtg.
SMOT06 SHIELD-Miniature Tube HCOSIO CLIP-Control Knob Retainer
5000I3 SOCKET-Dial Light Spring
$07Y09 SOCKET-7 Prong Miniature NCOSSS CLIP-Concentric Knob Re-
Laminated Plate tainer Spring
507MIO SOCKET-7 Prong Miniature "00559 cup-Dial Retainer
Molded Base NCOS76 CLIP-Lever Assy Spring

Page 7:

PAGE 20-38 BENDIX

MODELS 95133, 9

a 95mg: Revs

Stock Stock
llo. Synbcl IO. Description Ilo. SymbolY AVO. Description
HKOKOO KNOB-Key Pull Model 95MS HZOGOS GLIDE-Changer Models
MKOROS KNOB-Door Pull (l Machine 95MB & 9583
Screw Mig.) Model 9583 HZOHOB HINGE-Door Model 9533
HKORIS KNOB-Door Pull (2 Machine HZOMOQ HINGE-Door Models 95m &
Screws Mtg.) Model 95MS 95M9
HOOMOO ORNAMENT-Metal Grille HZOHII HANDLE-Door Model 95M9
Models 95m & 9583 MZOPOI PAD-Felt Lid Bumper
HPOEOD PLATE-LH. End (Rear View) JP2007 JG PLUG-2 Contact, FM Ant.
NPOEOI PLATE-RJ. End (Rear View) JR3002 JS RECEPTACLE-S Contact Long
HPOSOO PIN-Steel, Cabinet Mtg. Playing
HSOC78 SPRlNG-Lever Arm KCOBIG KNOB-Control Models 95MB
HSOSN STUD-Escutcheon Retainer & 95MQ
HSOSIS STUD-Lever Arm KCOLOS KNOB-Control Model 9583
HSOTOO STUD-Speaker Mtg. KSOBO2 KNOB-Phono Switch
HT0000 TACK-Ornamental (Metal) KYOBOZ KNOB-Concentric Models
Models 95MB lr 9583 95m & 95M9
HTOTOI TRACK-Record Changer KYOLOO KNOB-Concentric Model 9583
Model 95MS RDOFOI REFLECTOR-Dial Light
HTOTOZ TRACK-Center Record SCOTOI SHIELD-Record Changer
Changer Model 95M9 Tray Models 95MB &
Hwacoz wAsHER-#e cuptyve (sack saw
Cover) SC0T02v SHIELD-Record Changer Tray
HZOC08 CATCH-Bullet Models 9943 Model 95W
MZOCO9 CATCH-Bullet Model 95049 Long Playing Phono
HZOGOO GLiDE-Metal, Cabinet ZN7GO7 CABINET-Model 95M9
Tray Model 95M9 ZM7608 CABINET-Model 95MB

This supplement provides a revised schematic for 95
incorporates revisions made for 95M4_and 95134 Models, and
changes effected to date.

Series Models, and
record of production

CAPACITOR-Ceramic .001 mfd Min. Value

ohms 1/4 W
.47 ohms 1/2 w

Stock N0. Symbol N0. Description

o John F. Rider

Page 8:

BENDIX PAGE 20-39

MODELS 9553 Rev., 953k,

Ill i I I-l I|.l 'I II

o John F. Rider

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