Hammarlund Mfg. Co. 533 Schematic

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Product Information:
Model:533
Manufacturer:Hammarlund Mfg. Co.
Description:167

Schematics Content:

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Page 1:

PAGE 22-41 HOFFMAN
MODELS 533;`i _ '
MODEL 533 MODEL 534
Modern Style Traditional Style
Oak Cabinet Mahogany Cabinet
SPECIFICATIONS
Line Voltage 115V AC 60 cps Cabinet*
Power Consumption 95 Watts Hffight 36-1/2"
Tuning Ranges Width 26-1/4"
AM 535 KC to 1650 KC Depth 17-1/16"
FM 88 MC to 10BMC Record Changer Automatically plays 1" stack of
Number gf Tubes 3 7", 10", 12" records at 33-1/3
Audio Power Output 3.5 Watts rpm, 45 rpm, or 78 rpm.
Speaker Type 12" PM
* Where there are slight variations in certain of the dimensions for the two models, the largest value
MAJOR COMPONENTS
Cabinet Dial Glass 747
Model 533 7591 Backboard 3714
Model 534 7590 Record Changer Drawer 6656
Radio Chassis 167 Knobs
SPEUR.3ke1? 9070 Tuning 33517A
Antenna Off-On-Tone 33517A
AM Assembly 55214 Volume 33517A
FM Assembly 55218 Band Switch 33517C
Record Changer 9078
(C)John F. Rider

Page 2:

HOFFMAN PAGE 22-5
MODELS 533, A
/_FM Twm LEAD PHoNo \NPuT
FOLDED DIPOLE
3 Q ANT
AM LOOP ANTENNA
AC PLUG
ACCESSORY
RADIO CHASSIS
RECORD CHANGER
REMOVABLE
(C)John F., Rider
BLOCK DIAGRAM
Figure 1. Chassis 167

Page 3:

PAGE 22-6 HOFFMAN
Power Requirements:
Operating Voltage
ELECTRICAL AND MECHANICAL DATA
115 V AC 60 cps
TUBE COMPLEMENT
FM 88 MC to 108 MC l SBA6 AM-FM lst IF Amplifier V2
Audio Pogver Output 3_5 Watts 1 GBA6 FM 2nd IF Amplifier V3
Output Impedance 3.2 ohms at 400 cps 1 GALE FM Detector
Intermediate Frequencies: Audio (AM-FM)
` F 1 GVSGT Power Output
FM Antenna input impedance 300 ohms, balanced 1 5Y3GT Rectifier V8
Chassis 167 is an 8 tube combination AM-FM radio
receiver. It employs an indoor loop antenna for AM
reception and is designed to be used with an indoor FM
antenna in normal signal areas and an outside FM antenna
and a 300 ohm, balanced transmission line in weak
signal areas. The indoor antenna is located in the
receiver cabinet, and it should be discormected from the
FM antenna terminal posts when an outside antenna is
used. The chassis is mounted in place horizontally on
g rubber shock mounts which rest on wooden blocks that
are bolted in the chassis from below. Dial stringing
details are indicated in figure 2. Dial calibration
appears on the dial glass mounted on the front of the
VOLUME TUNING
BAND - ' / OFF-ON~
sw1TcH ? 'BC D EF/ ? TONE
Figure 3. Location of Controls
Note: The alignment calibration marks which appear on
the dial background plate are shovm lettered for identifi-
cation purposes. Pointer should be at "A" when condenser
; is in full mesh.
CONTROLS ,
~ Operation of the volume and tuning controls is
a straightforward. The BAND SWITCH has three positions
.` I. _ A for selecting one ofthe following: PHONO, AM radio,
\l' or FM radio. The PHONO position is obtained with the
- switch in the extreme counterclocl-:wise position and the
DIAL SHAFT other two positions are selected in the order listed by
| clockwise rotation of the band switch control shaft. The
v fourth control is the OFF-ON-TONE control. Extreme
CONDENSER PULLEY counterclockwise rotation of the control shaft turns the
, receiver off. Clockwise control turns the receiver on
' Figure 2. Dial Stringing and continuously changes the tone from bass to treble.
. ' AC POWER
' -i 3 SECONDARY
Figure 4. Trimmer Location- Bottom View
(C)J'ohn F. Rider

Page 4:

I-|9|=EL_v\/ui PAGE 2E
l ALIGNMENT
This section describes the minimum equipment and procedure that is required to align the re-
ceiver satisiactorily. Before beginning alignment, the tuning condenser must be fully open, and the
set should be allowed to warm up about 15 minutes. It is suggested that the alignment be performed I
on a metal-topped bench with generator., receiver, and voltmeter well bonded together. The bench
area should be free of strong extraneous radiation.
CW Signal Generator capable of providing the frequencies Listed in the table below. Must include
' audio modulating signal for AM alignment.
_ A voltmeter with at least a sensitivity of 20,000 ohms per volt (V.T.V.M. preferable). Should
have AC scale.
I Two 100K ohm composition resistors. A
Two 150 ohm composition resistors.
Figure 5. Bottom View, Tube Layout
l All voltages measured to chassis unless otherwise noted.
DC voltages measured with 20,000 ohm/volt meter.
All voltages DC unless otherwise noted.
All measurements made with no signal input to receiver and receiver operated at rated line voltage.
A- Measured-to pin 8
B - Measured with VTVM having lnsolating resistor in probe
C - Band switch ln AM position
D ~ Band switch in FM position
(C)John F. Rider

Page 5:

PAGE 22-8 HOFFMAN
The AM section should be completely aligned before beginning the FM alignment. For AM
alignment the generator is coupled to the receiver by placing the "hot" lead next to the antenna loop
so that lead and loop wire form a condenser. The voltmeter is connected across the voice coil and
switched to a low AC scale. The coupling for FM alignment is two 150 ohm composition resistors,
one in series with each generator lead. Before tuning the ratio detector transformer, solder two
100K ohm composition resistors in series from point "A", shown in figure 6, to ground. Remove
them before aligning the FM RF section.
Band Signal Connect Condenser
Step Switch Generator Signal Setting
No. Position Frequency To (See Fig. 3) Voltmeter Adjust Instructions
1 AM 455 KC 6BE6 Full Across T2 Pri., Sec. Adjust for max.
Mod. V7 Open Voice T4 Pri., Sec. output. Use as \/
Pin 'I Coil low a signal ln-
put as possible.
2 " 1650 KC Antenna " ' " C19 AM "
Mod. Loop as Osc. Trimmer
described
Trimmer
4 " 600 KC ' B ' Plates of C3 Bend plates as
just for max.
5 FM 10.7 MC FM Ant. Full Between T1 Pri., Sec. Adjust for max.
CW Terminals Open point A T3 Pri., Sec. voltmeter
and T5 Pri. only reading.
, 6 " " " ' Between T5 Sec. Adjust for zero
junction reading,using a
of two low signal in-
* 100K re- put to avoid
added and
point C.
'I " 107 MC " G Point A C6 FM Remove the two
CW to ground. Osc. Trimmer 100K resistors. X
Adjust for max. \_/'
' reading. Make
certain receiver
oscillator freq.
is 10.7 MC above
incoming signal
Trimmer
9 " 98 MC " D " Plates of C1 Bend plates as
just for max.
(C)John F. Rider

Page 6:

HOFFMAN PAGE 22 9
MODELS 533,
0
>> f{;?J~ ss 3% fad ~=> __-""?
Ill 0 l\\"~1 _.; ' '52 3 ix \-'E i
(C)John F. Rider

Page 7:

PAG 22-'I 1 HOFFMAN
me Pot
com
Pot w/Switch Tone Control
0
Wire Wound
0
n ess otherwise spec f e
Trxmmer AM Sect on
4 Sect on Variab e
Sect
Section
Paper
Section
Tam
Ceramic I-li-K
Section
Part N
bracket
mount
Loop Ante
Paper
Antenna P
ntenna Secondary
lst FM IF Transformer
Paper
0 Detector Tr
0
mature
P lot
Sock
was
values of c pa i a e 1-nicrofarads unless otherwise noted. .Symbol Part No. Value Tol. or Volts Type '
ll resistors are 1/ watt composition type wit values given in ohms _ .I
Symbol Part No. Value Tol. or Volts Type 45 6 3 K 1 W _
1 1 11 4502 2.2 meg
'7 4024 1.5 mmf Mica ` 16 20K
1 40 100 mmf Mica 2 45 0 1 W
1 44 ` 24 544 4.7 meg
2 118 . 2 600 V Paper L2 Oscillator Coil ( M) 5
29 4102 .005 600 V Paper L4 A (FM)
31 4001 270 mmf i V 6 Filament Cho e
20 ' 25 V Electrolytic T2 1st AM IF Transformer
20 450 V l ytic T3 2nd FM IF Transformer
20 l ytic T4 2nd AM IF Transformer
37 4 . % 400 V Paper , T6 Power Transformer
38 4100 .05 % 200 V Paper F T7 Output Transformer
39 4029 5000 mmf eramic I-li-K _ S1 Ban Switch
2 4101 _ 5 20% 400 V aper ia1Bac ground Plate 221 S ' 1 6103
3 1 . 600 v Molded Phenolic no , ndicator 365 so ' 1-
2 Kn , Plain 3 54A ' i mp 1

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