MODELS 619-T AND 723-C - CIRCUIT
ALIGNMENT TABLE.
| Order |
Connect "High" Side
of Generator to: |
Tune Generator
to: |
Tune Receiver Dial
to: |
Adjust for Maximum
Peak Output |
|---|---|---|---|---|
| I | R.F. Section of Gang | |||
| 2 | (centre portion) | 455 Kc/s | 540 Kc/s | LI7 Core |
| L | (centre portion) | 455 Kc/s | 540 Kc/s | LI6 Core |
| 3 | R.F. Section of Gang | |||
| 4 | R.F. Section of Gana | 455 KC/S | 540 KC/S | |
| (centre portion) | 455 Kc/s | 540 Kc/s | LI4 Core | |
| Repeat the | above adjustments un | til the maximum output | is obtained. | |
| 5 | Aerial Terminal | 600 Kc/s | 600 Kc/s | | Osc. Core Adj. (L7)* |
| 6 | Aerial Terminal | 1500 Kc/s | 1500 Kc/s | Osc. Adj. (C18) |
| 7 | Aerial Terminal | 1500 Kc/s | | 1500 Kc/s | R.F. Adj. (C10) |
| 8 | Aerial Terminal | 1500 Kc/s | 1500 Kc/s | Aer. Adj. (C4) |
| Repeat adjustme | nts 5, 6, 7 and 8. | |||
| 9 | Aerial Terminal | 16 Mc/s | 16 Mc/s | Osc. Adj. (C20)† |
| 10 | Aerial Terminal | 16 Mc/s | 16 Mc/s | R.F. Adj. (C9)‡ |
| 11 | Aerial Terminal | 16 Mc/s | 16 Mc/s | Aer. Adj. (C5)‡ |
*Rock the tuning control back and forth through the signal.
Use minimum capacity peak if two can be obtained. Check to determine that C20 has been adjusted to correct peak by tuning the receiver to approximately 15.09 Mc/s, where a weaker signal should be received.
‡Use maximum capacity peak if two can be obtained.
MECHANICAL REPLACEMENT PARTS.
| ltem | Part No. | ltem | Part No. |
|---|---|---|---|
|
Cabinet:
Model 619-T Model 723-C |
C89
C86 |
Dial, Scale:
Model 619-T Model 723-C |
23340
23342 |
| Cable, Speaker | 19188 | Drum, Drive: | |
| Cable, Volume | 23910 |
Model 619-T
Model 723-C |
22890
15684 |
|
Chassis, End:
Model 619-T— |
Knob | 4589 | |
| Left-Hand | 20124 | Socket, Valve | 19965 |
| Right-Hand | 22417 | Spindle, Assembly, Drive: | 22/24 |
| Left-Hand | 20318 | Model 723-C | 22388 |
| Kight-Hulid | 20310 | Strip, Tag: | |
| Dial, Frame Assembly: | I-way | 7628 | |
| Model 619-T | 20514 | 2-way | 8863 |
| Model 723-C | 20343G | 2-way | 8021 |
| Dial Pointer Assembly: | 3-way | 8821 | |
| Model 619-T | 20522 | 5-way | 15926 |
| Model 723-C | 20331 | Terminal, Spring | 5458 |
TECHNICAL INFORMATION AND SERVICE DATA
MODELS 619-T AND 723-C
FIVE-VALVE. TWO-BAND BATTERY/VIBRATOR.OPERATED SUPERHETERODYNES
ISSUED BY
AMALGAMATED WIRELESS (A/SIA) LTD.
Model 619-T
Model 723-C
ELECTRICAL SPECIFICATIONS.
FREQUENCY RANGES: Medium Wave: 540-1600 Kc/s (555-187.5 M) INTERMEDIATE FREQUENCY: 455 Kc/s
BATTERY COMPLEMENT:
| Cable with | Cable with | |
|---|---|---|
| (I) I 4-volt Accumulator | ) Tips | Plugs |
| 2 45-volt "B" Batteries | ∫ 19183 | 19803 |
| (2) I 1.5 volt Dry Cell "A" | ) | |
| Battery: | 19182 | 19801 |
| , |
NOTE: If a 1.5-volt dry cell "A" battery is used it is necessary, if dial illumination is required, to remove the dial lamp cable from the terminals on top of the chassis and to connect the cable to the outer terminals of a 4.5-volt "C" battery—see diagram "BATTERY CONNECTIONS".
VIBRATOR POWER UNIT OPERATION. Unit No. 19190: 1-4-volt accumulator
Unit No. 22770: 1-- 6-volt accumulator
BATTERY CONSUMPTION:
4-volt "A" battery, 0.2 amp. 1.5-volt "A" battery, 0.3 amp. "B" battery, 16 mA 4-volt vibrator operation, 0.8 amp.
DIAL LAMPS: 6.3 volt. 0.25 amp. M.E.S.
FUSES
Vibrator Operation: 3 amp.
VALVE COMPLEMENT:
- I. IT4 R.F. Amplifier
- 2. IR5 Converter 3. IT4 LF. Amplifier
- 4. IS5 Detector, A.F. Amplifier, A.V.C.
- 5. 3V4 Output
VIBRATOR CARTRIDGE
4-volt operation: V6804 6-volt operation: V521
LOUDSPEAKER (Permanent Magnet):
Model 619-T
- 7-inch code number AY40
- Transformer: XA8 V.C. Impedance 3 ohms at 400 C.P.S.
- Model 723-C
-
12-inch code number ÀU53
- Transformer: TU213 V.C. Impedance 6.5 ohms at 400 C.P.S.
UNDISTORTED POWER OUTPUT 200 milliwatte
MECHANICAL SPECIFICATIONS.
| Height Width | Depth | Height W | Vidth Dep | р |
|---|---|---|---|---|
| Cabinet Dimensions (inches): | Model 723-C | 35 13 | 3 | |
| Model 619-T 10½ 20¼ Model 723-C 31½ 33½ Chassis Base Dimensions (inches) 2½ 11 Carton Dimensions (inches) 2½ 11 |
8
|2 51 |
Weight (nett lbs.):
Model 619-T |
||
| Model 619-T | 11 | Cabinet Finish Walnut Veneer | , |
GENERAL DESCRIPTION.
The Models 619-T and 723-C are table and console models respectively, designed for either battery or vibrator operation. Battery and vibrator connections are shown in the accompanying diagram.
Features of design include: Tropic-proof construction, automatic volume control, magnetite cores in I.F. transformers and broadcast oscillator coils, air-dielectric trimming capacitors, straight-line edge-lighted dial scales.
Chassis Removal.
Model 619-T:
- (1) Remove the control knobs—each is held by a set-screw.
- (2) Disconnect the cable from the loudspeaker.
- (3) Disconnect the battery and vibrator cables.
- (4) The chassis is held in the cabinet by two screws. Remove these and withdraw the chassis.
Model 723-C:
- (1) Remove the control knobs. Each knob is held by a set-screw.
- (2) Disconnect the cable from the loudspeaker.
- (3) Disconnect the battery and vibrator cables.
(4) The chassis is held in the cabinet by four winged nuts, two at each end of the dial frame assembly. Removal of these enables the chassis to be withdrawn from the cabinet.
Dial Pointer Adjustment
The dial pointer is held in position by two rubber-lined clips. To alter the position of the pointer, loosen the two holding clips slightly and move the pointer in the required direction. It is important to reclamp the clips after any adjustment of the dial pointer.
Drive Cord Replacement
Follow the diagram which is affixed to the back of the dial frame assembly. This shows the route of the cord and the method of attachment.
CONTROLS 619-T & 723-C
ALIGNMENT PROCEDURE.
Manufacturer's Setting of Adjustments.
The receiver is tested by the manufacturer with precision instruments and all adjusting screws are sealed. Re-alignment should be necessary only when components in tuned circuits are repaired or replaced, or when it is found that the seals over the adjusting screws have been broken.
It is especially important that the adjustments should not be altered unless in association with the correct testing instruments listed below.
Under no circumstances should the plates of the ganged tuning capacitor be bent, as the unit is accurately aligned during manufacture and cannot be re-adjusted unless by skilled operators using specialised equipment.
For all alignment operations, connect the low side of the signal generator to the receiver chassis, and keep the generator output as low as possible to avoid A.V.C. action. Also, keep the volume control in the maximum clockwise position.
TESTING INSTRUMENTS
(I) A.W.A. Junior Signal Generator, type 2R3911, or
(2) A.W.A. Modulated Oscillator, type J6726.
If the modulated oscillator is used, connect an 0.25 megohm non-inductive resistor across the output terminals, and for short wave alignment an additional 400 ohms non-inductive resistor in series with the "high" output lead of the instrument.
(3) A.W.A. Output Meter, type 2M8832.
MODELS 619-T AND 723-C - CIRCUIT CODE.
|
Code
No. |
Description |
Part
No. |
Code
No. |
Description |
Part
No. |
Code
No. |
Description |
Part
No. |
Code
No. |
Description |
Part
No. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| INDUCTORS | R14 | 0.5 megohm, ½ watt | C14 | 70 uuF Mica | C35 | 0.01 uF Paper, 600v. | |||||
|
LI
L2, L3 |
Filter Unit (including CI)
Aerial Coil, 1600-540 Kc/s |
9382
|5454 23891 |
R 15
R 16 R 17 |
0.5 megohm, ½ watt
320 ohms, ½ watt 320 ohms, ½ watt |
C15 |
12-430 uuF Tuning,
Ganged (723-C) Ganged (619-T) |
18638
18637 |
C36 |
working
0.1 uF Paper, 200v. working |
||
|
L4, L5
L6, L7 |
Oscillator Coil, | 23071 | R18 | 50 ohms, ± 5%, 1 watt | C16 | 70 vuF Mica | C37 | 0.025 uF Paper, 400v. | |||
| 18 19 |
1600-540 Kc/s
Aerial Coil 6-18 Mc/s |
9206A
15456 |
KT7 |
C17
C18 |
70 uuF Mica
3-25 uu Air Trimmer |
19659 | C38 | 0.005 uF Paper, 600v. | |||
| LIO, LII | R.F. Coil, 6-18 Mc/s | 23892 | CI | 50 uuF Silvered Mica | C19 | 9 uuF Mica | 10450 | C39 |
working
400 uF 12, P.V. Electrolytic |
: | |
|
LI2, LI3
LI4, LI5 |
Oscillator Coil, 6-18 Mc/s
Ist I.F. Transformer |
22700 | CZ | Ganged (723-C) | 18638 |
C20
C21 |
4000 uuF Mica Padder, | 19029 | _ | TRANSFORMER | |
| LI6, LI7 | 2nd I.F. Transformer |
22703
17828 |
C2 |
12-430 uuF Tuning,
Ganaed (619-T) |
18637 | C22 | ± 2½% | TI |
Loudspeaker Transtormer
(723-C) |
TU213 | |
| LIU | RESISTORS | C3 | 0.05 uuF Paper, 200v. | oll | working | TI | Loudspeaker Transformer | XAS | |||
| RI | 0.1 megohm, 1 watt | C4 |
working
3-25 uuF Air Trimmer |
19659 | C23 |
0.01 uF Paper, 600v.
working |
LOUDSPEAKER | 7/10 | |||
|
R2
R3 |
0.1 megohm, ½ watt
0.1 megohm, ½ watt |
C5
C6 |
3-25 uuF Air Trimmer
0.05 uF Paper, 200v. |
19659 | C24 | 9 uuF Mica |
12-inch Permanent Magnet
(723-C) |
AU53 | |||
| R4 | 10,000 ohms, ½ watt | C7 |
working
9 uuF Mica |
C25
C26 |
· |
7-inch Permanent Magnet
(619-T) |
АУ40 | ||||
| R6 | 2.5 megohms, ½ watt | C8 | 0.05 uF Paper, 200v. |
C27
C28 |
100 uuF Mica
0.01 uF Paper, 600v. |
SI |
SWITCHES
Range Switch (723-C) |
23163 | |||
|
R7
R8 |
2.5 megohms, ½ watt
20,000 ohms, ½ watt |
C9 | 3-25 uuF Air Trimmer | 19659 | C29 | working | SI | Range Switch (619-T) | 23165 | ||
| R9 | 0.5 megohm Volume | 7690 |
C10
C11 |
3-25 uuF Air Trimmer
12-430 uuF Tuning, |
19659 | C30 | 20 uF 200, P.V. Electrolytic | c | 52 | (723-C) | 226 21 |
| R9 | 0.5 megohm Volume | / 400 | Ganged (723-C) | 18638 |
C31
C32 |
400 uF 12, P.V. Electrolytic
0.1 uF Paper, 200v. |
2 | S2 |
Battery/Tone Switch
(619-T) |
22632 | |
| RIO |
Control (619-1)
10,000 ohms, ½ watt |
6490 | СП | Ganged (619-T) | 18637 | working | S 3 | Dial Lamp Switch | 15915 | ||
| RII | 10 megohms, 1 watt | C12 |
Neutralising
470 uuF Mica Padder: |
C33 |
0.1 uF Paper, 200v.
working |
6-volt Power Unit | 22770 | ||||
|
RIZ
RI3 |
3.2 megohms, I watt | 015 | ± 2½% | C34 | 200 uuF Mica | 4-volt Power Unit | 19190 |
D.C. RESISTANCE OF WINDINGS
| Windings |
D.C. Resistance
in Ohms |
|---|---|
|
Aerial Coil (M.W.):
Primary (L2) Secondary (L3) Acrial Coil (S.W.): |
18
6 |
|
Primary (L8)
Secondary (L9) R.F. Coil (M.W.) |
3 |
|
Primary (L4)
Secondary (L5) R.F. Coil (S.W.): |
, 80
4 |
|
Secondary (L10)
Secondary (L11) Oscillator Coil (M.W.): Primary (L6) |
10
* * |
|
Secondary (L7)
Oscillator Coil (S.W.): Primary (L12) |
2 * |
|
Secondary (13)
I.F. Transformer Windings I.F. Filter (L1) I.T. Choke (L18) |
*
10 17.5† * |
|
Smoothing Choke (L75)
R.F. Filter Choke (L73, L74) R.F. Filter Choke (L71, L72) |
200
* 9 |
|
Loudspeaker Input
Transformer (TI): XA8 Primary |
425 or 510 |
|
XA8 Secondary
TU213 Primary TU213 Secondary Vibrator Transformer (T711) |
*
400 * |
|
17568 Primary
17568 Secondary 17892 Primary |
*
300 * |
| 17892 Secondary | 150 |
The above readings were taken on a standard chassis, but substitution of materials during manufacture may cause variations, and it should not be assumed that a component is faulty if a slightly different reading is obtained. †In some receivers this reading may be as high as 60 ohms. *Less than 1 ohm.
| Valves | Bias Volts |
Screen to
Chassis Volts |
Anode to
Chassis Volts |
Anode Current
mA |
Filament
Volts |
|||||
|---|---|---|---|---|---|---|---|---|---|---|
| В | V | В | ٧ | В | ٧ | В | ٧ | |||
|
IT4 R.F. Amp., M.W.
S.W. |
0 | 0 |
25†
35† |
30†
40† |
84 | 90 |
0.7
|.2 |
0.7 | 1.3 - 1.4 | |
|
IR5 Converter
IT4 I.F. Amp., M.W. |
0 | 0 |
50†
25† |
60†
30† |
50†
84 |
60†
90 |
1.0
0.7 |
1.0
0.7 |
1.3 - 1.4
1.3 - 1.4 |
|
|
S.W.
IS5 Det. A.V.C. A.F. Amp. |
0
0 |
0
-1.4 |
35†
15* |
40†
15* |
20* | 20* |
1.2
0.06 |
1.2
0.06 |
13 - 14 | |
| 3V4 Output | -5.5 | -5.5 | 84 | 90 | 80 | 85 | 7.0 | 8.0 | 1.3 - 1.4 | |
SOCKET VOLTAGES.
*Calculated from measured current. An ordinary voltmeter will register a lower value. †These readings may vary, depending on the resistance of the voltmeter used. Measured with no signal input. Volume control maximum clockwise.
VIBRATOR POWER UNITS 19190, 22770 - CIRCUIT CODE.
|
Code
No. |
Description |
Part
No. |
Code
No. |
Description |
Part
No. |
Code
No. |
Description |
Part
No. |
|---|---|---|---|---|---|---|---|---|
|
L71
L72 L73 |
INDUCTORS
R.F. Choke R.F. Choke R.F. Choke |
| 3809
| 3809 3 | 49 |
C72
C73 |
CAPACITORS
0.02 uF Paper, 600v. working 0.02 uF Paper, 600v. |
C78
C79 |
20 uF 200, P.V. Electrolytic
0.1 uF Paper, 2009, working (22770 only) |
||
|
L/4
L75 |
R.F. Choke
L.F. Choke |
3|49
832| |
C74 |
working
0.1 uF Paper, 400v. |
TRANSFORMERS | |||
| R71 |
ISO ohms, I watt (wire-
wound) |
C75 |
working
0.01 uF Paper, 600v. working |
T71 |
Vibrator Transformer
(19190) |
17568 | ||
| R72 |
12 ohms, 土 5%, 1 watt
(22770 only) |
C76 | 0.1 uF Paper, 400v. |
(22770)
Vibrator Cartridge |
17892 | |||
| C71 |
0.01 uF Paper, 600v.
working |
C77 | 0.01 UF Paper, 600v. |
(19190)
Vibrator Cartridge |
V6804 | |||
| - | working | (22/70) | V5211 |
VIBRATOR POWER UNIT No. 19190
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