Models 84, 193, 194, 501 and 310
FIVE VALVE, ONE BAND, A.C. OPERATED SUPERHETERODYNES
Technical Information & Service Data
ELECTRICAL SPECIFICATIONS.
|
TUNING RANGE.
"Standard Medium Wave"1600-550 K.C. |
R.F. ALIGNMENT SETTINCS.
600 K.C. (Osc.), 1500 K.C. (Osc. and Aerial). |
|---|---|
| INTERMEDIATE FREQUENCY | |
| POWER SUPPLY RATING(Instruments with other voltage and frequency ratings available.) | |
| POWER CONSUMPTION | 60 watts |
|
VALVE COMPLEMENT.
(1) 6A8G Frequency Converter. (2) 6U7G I.F. Amplifier. (3) 6B6G 2nd Det., A.V.C., and A.F. Amp. |
|
|
LOUDSPEAKER.
Model 84 |
4 Model 194 |
| Field Coil Resistance | . Model 84 |
| Voice Coil Impedance | Type AS7 2.2 ohms at 400 cycles |
| UNDISTORTED POWER OUTPUT | |
| DIAL LAMPS | |
|
CABINET STYLE
Model 84 Model 310 |
el Models 193, 194, 501 Console
|
GENERAL DESCRIPTION.
The Model 84 is a mantel type receiver housed in a moulded cabinet. The Models 193, 194 and 501 are consoles and the Model 310 a table model combination Radio-Phonograph.
A loop aerial is fitted within the cabinet of the Models 84 and 310, and it eliminates the necessity for an external aerial and earth connection, although provision is made so that these may be used when the receiver is installed in a situation remote from broadcasting stations.
The loudspeaker in the Model 84 is mounted on the chassis, while in the other models it is mounted in the cabinet and connected
by a cable and plug. Reference to the data above and to the circuit diagrams will show that the field coil of the loudspeaker fitted to the Model 84 is of lower resistance to that fitted to the other models. The power transformer secondary voltage is likewise lower in this receiver in order to compensate.
In the Model 310 the tone control and Radio-Phono switch are combined in a single control.
Apart from the differences mentioned above, the chassis used in all five models are similar.
ALIGNMENT PROCEDURE.
Alignment should only be necessary when adjustments have been altered from the factory setting or when repairs have been made to the tuned circuits. Climatic conditions should not seriously affect the receiver.
It is important to apply a definite procedure, as tabulated, and to use adequate and reliable test equipment. Instruments ideally suited to the requirements are the A.W.A. Junior Signal Generator, Type 2R3911, or the A.W.A. Modulated Oscillator, Type C1070 An output meter is necessary with both these instruments.
If the A.W.A. Type C1070 test oscillator is used, see that a 250,000 ohms resistor is connected between the output terminals of the instrument.
Connect the ground connection of the instrument to the receiver chassis.
Perform alignment in the proper order, starting with No. 1 and following all operations across, then No. 2, etc. Adjustment locations are shown in the layout diagrams. Keep the Volume Control set in the maximum clockwise position and regulate the output of the test instrument so that a minimum signal is introduced to the
ALLCHINACHT TADLE
receiver to obtain an observable indication. This will avoid A.V.C. action and overloading.
ADJUSTING TOOLS.
MODELC 04 AND 210
Two tools are used in the alignment procedure; one is a combination tool for air-trimmer adjustment and locking (Part No. 5371), and the other is a non-metallic screwdriver specially constructed for adjusting the cores with the I.F. transformers and oscillator coil (Part No. 5372). These tools may be obtained from the Service Department of the Company.
| ALIONWEN | WODELS OF | AND JIU. | ||||
|---|---|---|---|---|---|---|
| TEST INSTRUMENT | - | RECEIVER | Adjust for | Max Doak | ||
|
lignment
Order. |
Test Inst. Connection to Receiver. |
Test Inst.
Setting. |
Receiver Dial
Setting |
Circuit to
Adjust. |
Outp
84 |
out.
310 |
| 1 | *6A8G Grid Cap. | 455 K.C. | 550 K.C. | 2nd I.F. Trans. | L10 | L8 |
| 2 | *6A8G Grid Cap. | 455 K.C. | 550 K.C. | 2nd I.F. Trans. | L9 | L7 |
| З | *6A8G Grid Cap. | 455 K.C. | 550 K.C. | lst I.F. Trans. | L8 | L6 |
| 4 | *6A8G Grid Cap. | 455 K.C. | 550 K.C. | 1st I.F. Trans. | L7 | L5 |
| Repeat the above | adjustments before p | roceeding. | ||||
| 4 | **Inductively Coupled to Lo | юр—600 К.С. | 600 K.C.† | Oscillator | Core L6 | Core L4 |
| 5 | **Inductively Coupled to Lo | юр—1500 К.С. | 1500 K.C. | Oscillator | C 7 | C7 |
| 6 | **Inductively Coupled to Lo | юр—1500 К.С. | 1500 K.C. | Aerial | C2 | C2 |
| Repeat adjustments 4 | 5. and 6 |
* With grid clip connected. A .001 mfd, condenser should be connected in series with the hot output lead of the test instrument.
** A coil comprising 5 or 6 turns of 16 gauge D.C.C. wire and about 6 inches in diameter should be connected between the output terminals of the test instrument and placed parallel to and approx. 3 inches from the loop.
† Rock the tuning control back and forth through the signal. Reset the dial pointer to 600 K.C. if necessary. The pointer is soldered to the control wire and may be moved by applying a hot soldering iron to the connection.
ALIGNMENT TABLE - MODELS 193, 194, AND 501.
| TEST INSTRUMENT | - | RECEIVER | |||
|---|---|---|---|---|---|
|
Alignment
Order. |
Test Inst. Connection
to Receiver. |
Test Inst.
Setting. |
Receiver Dial
Setting. |
Circuit to
Adjust. |
Adjust for Max. Peak
Output. |
| 1 | *6A8G Grid Cap. | 455 K.C. | 550 K.C. | 2nd I.F. Trans. | L10 |
| 2 | *6A8C Grid Cap. | 455 K.C. | 550 K.C. | 2nd I.F. Trans. | L9 |
| З | *6A8G Grid Cap. | 455 K.C. | 550 K.C. | lst I.F. Trans. | L8 |
| 4 | *6A8G Grid Cap. | 455 K.C. | 550 K.C. | 1st I.F. Trans. | L7 |
| Repeat the above adjus | tments before procee | ding. | |||
| 5 | Aerial Term. | 600 K.C. | 600 K.C.† | Oscillator | Core L6 |
| 6 | Aerial Term. | 1500 K.C. | 1500 K.C. | Oscillator | C7 |
| 7 | Aerial Term. | 1500 K.C. | 1500 K.C. | Aerial | C2 |
| Repeat adjustments 5 6 | and 7 |
* With grid clip connected. A .001 mfd. condenser should be connected in series with the "hot" output lead of the test instrument. † Rock the tuning control back and forth through the signal. Reset the dial pointer to 600 K.C. if necessary. The pointer is soldered to the control wire and may be moved by applying a hot soldering iron to the connection.
MECHANICAL REPLACEMENT PARTS.
| Description. | Part No. | Description. | Part No. | |
|---|---|---|---|---|
| Dial Pointer and Drive Wire Dial Pointer Tension Spring Drive Wire Jockey Pulleys Drive Drum Tuning Control Spindle |
··· ··
··· ·· ··· ·· |
8405
1741 1730 5068 8119 |
Knobs—Volume and Tone Control |
7482
7483 7686 4194 8145 4704 |
|
Tuning Control Extension Spindle
Models 193, 501 |
8078 | Value Shields . |
8147
7459 |
|
| Model 194 | · |
8077
8274 7687 7688 |
Cone Assembly for Loudspeaker— Type AA4 ,, AS7 ,, AW2 |
8207
7071 8208 8588 |
CIRCUIT DIAGRAM AND CODE—MODELS 84, 193, 194 AND 501.
|
Code
No. L1, L2 L3, L4 L5, L6 L7, L8 L9, L10 |
Part
No. 7972 7647 7638 7639 7641 |
COILS.
Loop Aerial (Mantel). Aerial Coil (Console). Oscillator Coil. 1st 1.F. Transformer. 2nd 1.F. Transformer. |
Code
No. R1 R2 R3 R4 R5 |
Part
No. |
RESISTORS.
50,000 ohms 1/3 W. 20,000 ohms 1 W. 30,000 ohms 1 W. 20,000 ohms 2 W. 1.75 megohms 1/3 W. |
Code
No. C1 C2 C3 C4 |
Part
No. CONDENSERS 4 mmfd, mica (Console only) 5462A 6-14 mmfd, air trim. 7645 Tuning condenser. |
C13
C14 C15 C16 C17 C18 |
115 mmfd. mica (A)
115 mmfd. mica (A). 110 mmfd. mica (L). .01 mfd. paper. 350 mmfd. mica. |
|---|---|---|---|---|---|---|---|---|---|
|
T I
Console Mantel T I Console Mantel |
7999A
7635 8001A 7636 |
TRANSFORMERS.
50-60C. Fower Transformer. 40C. |
R6
R7 R8 R9 R10 |
7690 |
500,000 ohms Vol.
Control. 10 megohms 1 W. 250,000 ohms 1 W. 500,000 ohms 1/3 W. 25,000 ohms 1/3 W. |
C5
C6 C7 C8 |
.05 mfd. paper.
420 mmfd. mica (padder). 4849A 16-24 mmfd. air trim. 7645 Tuning condenser. |
C19
C20 |
.035 mfd, paper.
.02 mfd, paper. (Mantel). .005 mfd, paper (Console). |
|
Т2
Т3 |
XA2
TU2 |
Loudspeaker Trans-
former. Loudspeaker Trans- former. |
R11
R12 R13 R14 |
5000 ohms 1/3 W.
250 ohms 3 W. 50 ohms 3 W. 1.75 megs. 1/3 W. |
C10
C11 C12 |
.1 mtd. paper.
70 mmfd. mica (N). 70 mmfd. mica (N). .1 mfd. paper. |
C21
C22 C23 C24 |
8 mfd. 500V. electro
8 mfd. 525V. electro 8 mfd. 525V. electro. 50 mmfd. mica (D). |
CIRCUIT DIAGRAM AND CODE-MODEL 310.
| Code | Part | COLLE | Code | Part | DECISTOR | Code | Part | C12 | .1 mfd. paper. | |
|---|---|---|---|---|---|---|---|---|---|---|
| No. | No. | COILS | NO. | No. | RESISTORS. | N0. | No. | CONDENSERS, | C13 | .035 mfd. paper. |
| L1, L2 | 8428 | Loop Aerial. | RI | 50,000 ohms 1/3 W. | CI | Deleted. | C14 | .01 mfd. paper. | ||
| L3, L4 | 7638 | Oscillator Coil. |
RZ
R3 |
20,000 onms I W.
30,000 ohms I W. |
C2 | 4642A | 6-14 mmfd. air trimmer | C15 | 115 mmfd, mica (A). | |
| L5, L6 | 7639 | 1st 1.F. Transformer. | R4 | 20,000 ohms 2 W. | C3 | 7645 | Tuning condenser | C16 | 115 mmfd. mica (A). | |
| L7. L8 | 7641 | 2nd I.F. Transformer, | R6 | 50.000 ohms 1/3 W. | C4 | .05 mfd. paper. | C17 | 110 mmfd, mica (L), | ||
| , | TDANCEODAUDC | R7 | 7007 | 50,000 ohms 1/3 W. | C5 | .05 mfd. paper. | C18 | .01 mfd, paper, | ||
| TRANSFORMERS. | R8 | 1921 | 500,000 ohms Vol. | C6 | 420 mmfd, mica | C19 | 50 mmfd. mica (D). | |||
| TI | 7999/ | Power Transformer, | R9 | 10 megohms 1 W. | C7 | 4940 4 | (padder). | C20 | 350 mmfd. mica. | |
| 50-60C. |
R10
R11 |
250,000 ohms 1 W.
30,000 ohms 1/3 W |
Ci | 4849A | trimmer. | C21 | .01 mfd. paper. | |||
| ΤI | 8001A | Power Transformer, | R12 | 500,000 ohms 1/3 W. | C8 | 7645 | Tuning condenser. | Ċ22 | 8 mfd., 500V. electro. | |
| 40C. | R13 | 25,000 ohms 1/3 W. | C9 | .1 mfd. paper. | C23 | 8 mfd., 525V, electro, | ||||
| 72 | TU2 | Loudspeaker Trans- | RIS | 250 ohms 3 W. | C10 | 70 mmfd, mica (N). | C24 | .01 mfd. paper. | ||
| former. | R16 | 50 ohms 3 W. | C11 | 70 mmfd. mica (N). | C25 | .0025 mfd. paper. | ||||
SOCKET VOLTAGES (84).
| VALVE. |
Grid to
Chassis Volts. |
Grid to
Chassis Volts. |
Plate
to Chassis Volts. |
Plate
Current M.A. |
Heater
Volts. |
|---|---|---|---|---|---|
| 6A8G Detector | -3* | 95 | 240 | З | 6.3 |
| Oscillator | 160 | 4 | |||
| 6U7G I.F. Amp. | 3* | 95 | 240 | 8.5 | 6.3 |
| 6B6G 2nd Det. | 0 | 120* | 0.5 | 6.3 | |
| 6F6G Pentode | -17* | 240 | 225 | 30 | 6.3 |
| 5Y3G Rectifier | 640/320 | volts, 60 | M.A. Tota | l curren | t, 5.0 |
Voltage across loudspeaker field----60 volts. * Cannot be measured with ordinary voltmeter.
SOCKET VOLTAGES (193, 194, 501 and 310).
| VALVE. |
Grid to
Chassis Volts. |
Grid to
Chassis Volts. |
Plate
to Chassis Volts. |
Plate
Current M.A. |
Heater
Volts. |
|
|---|---|---|---|---|---|---|
| 6A8G | Detector | -3* | 95 | 240 | 3 | 6.3 |
| 1 | Oscillator | 160 | 4 | |||
| 6U7G | I.F. Amp. | -3* | 95 | 240 | 8 | 6.3 |
| 6B6G | 2nd Det. | 0 | 120* | 0.5 | 6.3 | |
| 6F6 C | | Pentode | -17* | 240 | 225 | 30 | 6.3 |
| 5Y3G | Rectifier | 740/370 | volts, 60 | M.A. To | tal curre | nt, 5.0 |
Voltage across loudspeaker field-120 volts.
* Cannot be measured with ordinary voltmeter.
PHONO. MOTOR SERVICE (MODEL 310)
LUBRICATION
As the rotor bearings are of the self-lubricating type, little attention is required. After 1,000 hours running, place a few drops of oil in the hole in the phosphor bronze bearing and in the hole in the casting at the other end.
Remove the turntable and two lubricating points are reached through two holes in the top plate of the motor—to the right of the regulating spindle—looking from the front of the motor. The turntable spindle top bearing should be lubricated periodically at the point where it enters the top plate of the motor.
SPEED REGULATION.
When despatched from our Works, "Garrard" Motors are set on 230 volts to run at a turntable speed of 78 r.p.m. when lever is set at this point on the indicator plate.
The speed of the motor may vary slightly with different voltage supplies and should be checked by means of the stroboscope supplied, or by counting the number of revolutions per minute.
If adjustment is necessary, it can easily be carried out. Move the regulating lever until the correct speed is obtained. Next remove turntable, loosen quadrant screw in speed adjusting quadrant. Then replace regulating lever on the "78" mark, or centre position on the indicator plate. Tighten the screw, speed should then be correct.
STARTING AND STOPPING MOTOR.
The action of lifting the Pick-up Head off the Rest and moving slightly towards the right releases the brake and switches the current on. When the end of the Record (with run-off or eccentric groove) is reached, the Motor is automatically stopped and the current switched off.
To stop the motor by hand, lift the pick-up and move arm inwards toward centre of record, when stop mechanism will operate.
PRINCIPLE OF ACTION.
The "GARRARD" Patent Stop and Switch is fully automatic.
As the needle travels towards the centre of the Record, the Pick-up Arm moves Friction Plate A (see diagram), which, through the friction pad and spring, carries with it the Main Lever B and Trip Lever C.
This Main Lever moves in towards the Turntable Spindle, on which is mounted the Striker, which gently wipes against the rubber bush on end of Trip Lever C at every revolution, thus tapping back the Main Lever B (the friction between Lever A and Lever B allows this).
The "tapping back" process continues until the needle reaches the "run-in" groove in the centre of the record. The trip lever is now moved forward into the path of the striker, which strikes the side of the lever and trips the Stop mechanism.
ADJUSTMENTS.
If Stop fails to operate at finish of record, there is probably insufficient friction between lever A and lever B. This may be rectified by turning the friction screw in lever B in a counter-clockwise direction.
When Stop operates early, i.e., before needle reaches the end of the record, the trouble is either due to excessive friction or to the rubber bush on the trip lever being worn. Friction can be reduced by turning the friction screw clockwise.
As this adjustment is very sensitive, the screw should not be turned more than a quarter of a turn at a time. Excessive friction may cause a knocking sound to be heard in the loudspeaker and undue wear on records.
When the rubber bush is worn, this may be turned round on its pin to expose a new face to the striker.
A brake pad is provided which is automatically applied to the turntable rim after switching off. It can be adjusted by loosening the two screws securing the brake pad lever. After adjustment, it is important to verify that the switch breaks contact before brake operates.
Layout Diagram (Underneath View), Models 84, 193, 194 and 501.
Layout Diagram (Underneath View), Model 310.
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