TECHNICAL INFORMATION AND SERVICE DATA
RADIOLA
Models 611-T,709-C, 802-G & 802-GY EIGHT VALVE, SEVEN BAND, A.C. OPERATED SUPERHETERODYNE
ISSUED BY AMALGAMATED WIRELESS (A/SIA.) I.TD.
ELECTRICAL SPECIFICATIONS.
FREQUENCY RANGES:
(1) 1500-540 kc. ..................................
INTERMEDIATE FREQUENCY 455 kc.
POWER SUPPLY RATINGS:
Models 611-T and 709-C: 200-260 volts A.C., 50-60 C.P.S.
Models 802-G and 802-GY: 200-260 volts A.C., 50 C.P.S.
(Models are produced with other voltage and frequency ratings.)
POWER CONSUMPTION
VALVE COMPLEMENT:
- (1) 6U7G R.F. Amplifier.
- (2) 6J8G Converter.
- (3) 6U7G I.F. Amplifier.
- (4) 6SQ7GT Detector, A.V.C. and A.F.
- (6) 6V6GT/G Push-pull Output.
(5) 6SJ7GT Phase Splitter.
......................................
-
(7) 6V6GT/G Push-pull Output.
(8) 5Y3GT/G Rectifier
- o) 51301/9 Rectifier.
LOUDSPEAKER:
Model 611-T: Ma 7 inch—Code No. AW22. Transformer—XAII. Field Coil Resistance— 1100 ohms.
V.C. Impedance—3 ohms
at 400 C.P.S.
Model 709-C & 802-GY.
12 inch—Code No. AS19. Transformer—TX36.
Field Coil Resistance— 1100 ohms.
V.C. Impedance—2.2 ohms at 400 C.P.S.
Model 802-G.
12 inch—Code No. AS18. Transformer—TX5
Field Coil Resistance-1500 ohms.
V.C. Impedance-12.5 ohms at 400 C.P.S.
UNDISTORTED POWER OUTPUT ...... 6 watts
DIAL LAMPS (3) ...... 6.3 volt, 0.25 amp.
CONTROLS:
|
LI, 2, 3
LI, 2, 3 LI, 2, 3 LI, 2, 3 LI, 2, 3 LI, 2, 3 LI, 2, 3 LI, 2, 3 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 LI, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 23 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L1, 12 L2, 23 L2, 24 L2, 28 L2, 28 L2, 28 L2, 28 L2, 28 L2, 28 L3, 34 L3, 34 |
Cola II. |
|---|---|
| INDUCTORS.Aerial Coil 13-16 metres9852Aerial Coil, 20-25 metres9852Aerial Coil 25-31 metres9852Aerial Coil 31-83 metres9854Aerial Coil 31-83 metres9853R.F. Coil 13-16 metres9853R.F. Coil 20-25 metres9853R.F. Coil 20-25 metres9853R.F. Coil 31-83 metres9853R.F. Coil 20-25 metres9853R.F. Coil 20-25 metres9853R.F. Coil 31-83 metres9853R.F. Coil 31-83 metres9855R.F. Coil Broadcast9749AOscillator Coil 13-169747Oscillator Coil 13-169747Oscillator Coil 20-259745Oscillator Coil 31-839743Oscillator Coil Broadcast9744Oscillator Coil Broadcast97411500-540 kc.9741Speaker Field 1100 ohms.92872 | . Description. or PartNo. |
|
R12
R17 R12 R17 R12 R17 R17 R17 R17 R17 R17 R17 R17 R17 R17 |
Circuit
Code No. |
| I megohm, ½ watt 20,000 ohms, 1 watt 32,000 ohms, 2 watt 16,000 ohms, 2 watt 1.6 megohm, ½ watt 1.6 megohm, ½ watt 20,000 ohms, 1 watt 1.6 megohm, ½ watt 20,000 ohms, 1 watt 20,000 ohms, 1 watt 20 ohms, 1 watt, wir 20 ohms, 1 watt, wir 20 ohms, 1 watt, wir 20 ohms, 1 watt, wir 20 ohms, 1 watt, wir 20 ohms, 1 watt, wir 20 ohms, 1 watt 20 ohms, 1 watt 20 ohms, 1 watt 20 ohms, 1 watt 20 ohms, 1 watt 0.2 megohm, 1 watt 50,000 ohms, 1 watt 0.1 megohm, 1 watt 1 megohm, 1 watt 1 megohm, 1 watt 0.1 megohm, 1 watt 1 megohm, 1 watt 1 megohm, | Description. |
|
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e wound e wound e wound e wound e wound ire ire ire ire ire |
Stock Code
or PartNo. |
|
Circuit
Code No. |
|
|
Description |
|
nmer
mer er er er er er er er er er |
Stock Code
or Part No. |
| 12 1 |
Circuit
Code No. |
|
Description. or Part |
YJ-208 & J-208 (J-607 (T-116
CIRCUIT CODE-Models 611-T and 709-C
CHASSIS (UNDERNEATH VIEW).
MECHANICAL SPECIFICATIONS.
| Height | . Width. | Depth. | Overall Chassis Height | ||
|---|---|---|---|---|---|
| Cabinet Dimensions (inches)- | Weight (nett lbs.)— | ||||
| Table | 12 | 26 | 1 - H | Table | |
| Console |
32
|
33 | 13 | Console | |
| Combination | 32 | 36 | 16 | Combination | |
| Chassis Base Dimensions (inches) | 31 | 16 | 7 1 | Cabinet Finish | Inut Vene |
ALIGNMENT PROCEDURE.
Alignment should be necessary only 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 given in this booklet, and to use adequate and reliable test equipment. Instruments ideally suited to the requirements are either the A.W.A. Junior Signal Generator type 2R3911, or the A.W.A. Modulated Oscillators type J6726 and C1070*. An output meter is necessary with both these instruments, the recommended type having an output impedance of 12000 ohms and a range of 5-6000 milliwatts. The meter should be connected across the primary of the loudspeaker transformer with the voice coil of the loudspeaker open-circuit. If the output meter used is one which does not impress a load on the anode circuit of the output valve it will not be necessary to open-circuit the voice coil.
As the calibration of the band-spread bands requires great accuracy, it is recommended that an A.W.A. Crystal Calibrator, type 6795, be used after setting the oscillator calibration to check the accuracy of the signal generator. The crystal calibrator emits a modulated signal at intervals of either 100 or 1000 kc/s, throughout the radio frequency spectrum, thus providing a series of fixed and equally spaced calibration points of known accuracy. When using this instrument care should be taken to select the correct signal. With the crystal set at the 1000 kc. position, a spurious image signal can generally be obtained by turning the tuning control of the receiver to a point approximately 100 kc/s, higher in frequency. This is a useful check as to whether a harmonic or spurious image is being tuned. If a crystal calibrator is not available, broadcasting stations of known frequency may be used as an alternative.
When using a signal generator or modulated oscillator with the tuning of the receiver fixed, two frequencies can be tuned from the test instrument, one 0.92 Mc/s higher in frequency than the other. In all cases the desired frequency is the lower of the two.
A convenient alignment jig designed to hold the receiver chassis and fitted with a dial scale and pointer may be obtained from the Service Department of the Company.
With this jig alignment may be carried out with the chassis coupled to an actual scale, thus ensuring that the calibration will be correct when the chassis is placed in the cabinet; otherwise, use the 0-180° calibration scale on the drum. (See alignment table.)
For all alignment purposes connect the "low" side of the signal generator to the receiver chassis.
Perform alignment in the proper order as shown in the chart, starting from No. I and following all operations across, then No. 2, etc.
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 receiver to give a standard indication on the output meter. This will avoid A.V.C. action and overloading.
When the receiver has been satisfactorily aligned, seal the adjusting screws with a small quantity of cellulose cement.
* If a type J6726 or C1070 instrument is used, see that a 250,000 ohm resistor is connected between the output terminals, and for short wave alignment a 400 ohm non-inductive resistor in series with the active output lead.
SIMPLE SHORT WAVE CALIBRATION ADJUSTMENT.
The short wave calibration may be adjusted slightly, without removing the chassis from the cabinet for full alignment, by adjusting four cores, L19, L21, L23 and L25 after a station of known frequency is received.
The correct procedure is as follows:------------------------------------
- (1) Set the dial pointer so that calibration is correct on the medium wave band.
- (2) To adjust the calibration of the 22.3-17.7 Mc. band, tune in the known station, and to shift the pointer position to the left, turn L19 clockwise or vice-versa until the station can be tuned in at its assigned frequency.
- (3) The adjustments for the 19.0-15.0, 15.0-11.7 and 12.0-9.4 Mc. bands are similar, using L21, L23, and L25 respectively.
| ALI | GNM | IENT | TABL | E . |
|---|
|
Align-
ment Order. |
Tes
Connect to Receiv er. |
Frequency
Setting. |
Band
Setting. |
Calibration
Scale Setting. |
Circuit to
Adjust. |
Adjustment
Symbol. |
Adjust to
Obtain. |
|---|---|---|---|---|---|---|---|
| | | 6J8G Cap.* | 455 kc. | Broadcast | 0° | 2nd I.F. Trans. | Core L36 | Max. Peak |
| 2 | 6J8G Cap.* | 455 kc. | Broadcast | 0° | 2nd I.F. Trans. | Core L35 | Max. Peak |
| 3 | 6J8G Cap.* | 455 kc. | Broadcast | 0° | Ist I.F. Trans. | Core L34 | Max. Peak |
| 4 | 6J8G Cap.* | 455 kc. | Broadcast | 0° | Ist I.F. Trans. | Core L33 | Max. Peak |
| Re-check I, | 2, 3, and 4. | ||||||
| 5 | Aerial | 600 kc. | Broadcast | | 19° | Oscillator† | Core L31 | Max. Peak |
| 6 | Aerial | 1500 kc. | Broadcast | 168° | Oscillator | CH | Calibration |
| 7 | Aerial | 1450 kc. | Broadcast | 158° | Radio Frequency | C27 | Calibration |
| 8 | Aerial | 1450 kc. | Broadcast | 158° | Aerial | C7 | Max. Peak |
| 1. A. A. | Re-check S | 5, 6, 7, and 8 | 3 | ||||
| 9 | Aerial | |17.8 Mc. | 22.3-17.7 Mc. | | 18° | Oscillator | Core L19 | Calibration |
| 10 | Aerial | 17.8 Mc. | 22.3-17.7 Mc. | 18° | Radio Frequency† | C24 | Max. Peak |
| Aerial | 17.8 Mc. | 22.3-17.7 Mc. | 18° | Aerial | C4 | Max. Peak | |
| 12 | Aerial | 21.0 Mc. | 22.3-17.7 Mc. | 149° | Oscillator | C9 | Calibration |
| 13 | Aerial | 15.2 Mc. | 19.0-15.0 Mc. | 27° | Oscillator | Core L21 | Calibration |
| 14 | Aerial | 11.8 Mc. | 15.0-11.7 Mc. | 25° | Oscillator | Core L23 | Calibration |
| 15 | Aerial | 11.8 Mc. | 15.0-11.7 Mc. | 25° | Radio Frequency† | C25 | Max. Peak |
| 16 | Aerial | 11.8 Mc. | 15.0-11.7 Mc. | 25° | Aerial | C5 | Max. Peak |
| 17 | Aerial | 9.5 Mc. | 12.0-9.4 Mc. | 24° | Oscillator | Core L25 | Calibration |
| 18 | Aerial | 9.0 Mc. | 9.7-3.6 Mc. | 156° | Oscillator | C13 | Calibration |
| 19 | Aerial | 9.0 Mc. | 9.7-3.6 Mc. | 156° | Radio Frequency† | C26 | Max. Peak |
| 20 | Aerial | 9.0 Mc. | 9.7-3.6 Mc. | 156° | Aerial | C6 | Max. Peak |
| 21 | Aerial | 4.0 Mc. | - 9.7-3.6 Mc. | 19° | Oscillator | Core L27 | Calibration |
| en an Arran | e de la contra de | Re-chek 18, 19 | 7, 20 and 21 | ||||
| 22 | Aerial | | 1.6 Mc. | 4.0-1.5 Mc. | 150° | Oscillator | Core L29 | Calibration |
| 23 | Aerial | 3.7 Mc. | 4.0-1.5 Mc. | 153° | Oscillator | C14 | Max. Peak |
| Re-check 2 | 22 and 23 |
Finally, re-check broadcast band. This is necessary only if the setting of C9 has been altered.
t Rock the tuning control back and forth through the signal.
* With grid clip connected. A 0.001 uF capacitor should be connected in series with the "high" side of the test instrument.
The column headed "Calibration Scale Setting" refers to the 180° scale on the ganged tuning capacitor drive drum. In taking readings on this scale, read from the right-hand edge of the pointer, that is, the edge nearest the rear of the chassis. Check the setting of the drum before taking readings. The zero mark should be opposite the pointer with the tuning capacitor fully closed.
CHASSIS REMOVAL AND REPLACEMENT.
Table and Console Models.
(1) Turn the Phono-Range Switch to the 22.3-17.7 Mc. position and then remove the three control knobs from the front of the cabinet. These knobs are each held by one set screw.
To remove the two knobs at the side of the cabinet, proceed as follows:---
Table Model:
The knobs pull straight off. Do not loosen the set screw in the lower knob. If difficulty is experienced in removing this knob, refer to the label adhered to the inside of the cabinet for instructions.
Console Model:
The knobs are not removed but the spindles to which they are attached are parted at the couplings within the cabinet.
- (2) Disconnect the dial pointer from the drive cord, first unscrewing the thumb nut, and disconnect the cable from the loudspeaker. Also disconnect the dial lamp lead from the chassis.
- (3) Remove the four chassis mounting bolts and withdraw the chassis slightly to free the spindles from the front of the cabinet and move it to the right to allow access to the Band Indicator.
(4) Disconnect the Band Indicator control cord. To do this, slip the loop in the end of the cord from the peg on the indicator, loosen the thumb-screw which holds the flexible tube at the top left-hand corner of the dial assembly and pull the control cord and tube free from the dial. The chassis may now be removed from the cabinet.
(5) Upon replacing the chassis in the cabinet the position of the Band Indicator may be adjusted by lifting the flexible tube to the required height before tightening the thumb-screw. It is also necessary to connect the pointer to the drive cord at the correct point. To do this, set the pointer opposite a known broadcasting station and connect it when the receiver has been
Combination Model.
accurately tuned to that station.
- (1) Disconnect the loudspeaker, phono motor and pick-up cables.
- (2) Pull the Phono-Range Switch knob off. Pull the Tuning Control knob to part the spindle within the cabinet. This knob is not removed, but is left resting in the hole in the cabinet.
- (3) Four screws around the control panel mount the chassis in the cabinet. Remove these and lift the chassis out by grasping the two wooden handles provided on the control panel for this purpose.
| - | ||||||
|---|---|---|---|---|---|---|
| Valve. |
Control Grid
to Chassis Volts. |
Cathode to
Chassis Volts. |
Screen Grid
to Chassis Volts. |
Plate to
Chassis Volts. |
Plate
Current mA. |
Heater
Volts. |
| 6U7G R.F. Amplifier, M.W | 3.6* | 0 | 100 | 250 | 8.0 | 6.3 |
| S.W | 3.5* | 0 | 100 | 250 | 8.0 | |
| 6J8G Converter, M.W. | 3.9* | 0 | 100 | 250 | 0.8 | 6.3 |
| S.W | 4.5* | 0 | 100 | 250 | 0.6_0.8 | · |
| Oscillator, M.W | — | 130 | 5.0 | - | ||
| S.W | — | 130 | 5.0 | |||
| 6U7G I.F. Amplifier, M.W | 3.9* | 0 | 100 | 250 | 8.0 | 6.3 |
| S.W | 3.5* | 0 | 100 | 250 | 8.0 | 6.3 |
| 6SQ7GT Detector, A.V.C. and A.F |
e
La statu di La statu ese |
an a | ||||
| Amp | 1.7* | 0 | 143* | 0.5 | 6.3 | |
| 6SJ7GT Phase Splitter | 0 | 70 | 145 | 0.5 | 6.3 | |
| 6V6GT/G Push Pull | 0 | 16 | 250 | 243 | 18.0 | 6.3 |
| 6V6GT/G Output | 0 | 16 | 250 | 243 | 18.0 | 6.3 |
| 5Y3GT/G Rectifier | • | 690/345 volts, 7 | 3 mA. total curr | ent drain. |
SOCKET VOLTAGES AND CURRENTS.
Voltage across loudspeaker field—110 volts.
* Cannot be measured with ordinary voltmeter. Measured with receiver connected to 240 volts A.C. supply. No signal input. Volume Control at maximum.
MECHANICAL REPLACEMENT PARTS.
| ltem. | Part No. | ltem. | Part No |
|---|---|---|---|
| Cabinet, console | C69Z | Dust cover, loudspeaker— | nina di di |
| Cabinet, combination | C48 | ASI8 and ASI9 | 10306 |
| Cabinet, table | C67Z | AW22 | 9843 |
| Cable hand indicator | 20375 | Knob | 4589 |
| 10025 | Knob, range switch | 5846 | |
| 17725 | Knob, tuning | 8075 | |
| Cable, pick-up | 15432 | Mount plate assembly, tuning drive- | - |
| Cable, power | 209 | Table | 17816 |
| Cable, power switch | 19089 | Console | 9916 |
| Cable, volume control | 15355 | Pulley, brass | 7885 |
| Cable, tone ontrol | 19927 | Screen, I.F. transformer | 3351 |
| Chassis, end, right hand | 19080 | Сар | 8372 |
| left hand | 9875 | Screen, valve | 8147 |
| Clip, grid | 7459 | cap | 8148 |
| Cone Assembly, loudspeaker- | Socket, dial lamp | 4194 | |
| Type AW22 | 9356 | Socket, valve | 4704 |
| Type ASI8 | 9332 | Socket, valve, cushion | 7326 |
| 20185 | Spindle, tuning drive, table | 17739 | |
| 11403 | console | 9812 | |
| 11100 | Spindle, range switch extension— | ||
| large | 11400 | Table | 19066 |
| Dial frame assembly— | Console | 19584 | |
| Table | 20249A | Combination | 10193 |
| Console | 20251A | Spindle, tuning control extension | 19583 |
| 802-G | 19939 | Spring, band indicator | 8364 |
| 802-GY | 19939B | Spring, drive tension | 6641 |
| Dial Scale | 20159 | Strip, tag, I way | 7628 |
| 10100 | 2 way | 8863 | |
| 00070 | 3 way | 9877 | |
| Drum, band indicator | 203/3 | 7 way | 9879 |
| Drum, drive | 9090 | Washer, felt | 4935 |
| 802-G |
|---|
| and |
| 802-G |
| CODE-Models |
| CIRCUIT |
| Code No. | Description |
Stock Code
or Part No. |
Circuit
Code No |
. Description. |
Stock Code
or Part No. |
Circuit
Code No. |
Description. Stock C | ode Circ |
uit
e No. Description. |
Stock Code
or Part No. |
|---|---|---|---|---|---|---|---|---|---|---|
| INDUCTORS. | * | RESISTORS. | CAPACITORS. | 5 | 0.02 uF paper, 600 v. | working | ||||
| LI, 2 | Aerial Coil 13-16 met | tres 9852 | RI |
I megohm,
|
Ū | 52 uuF mica + 2 uuF | C42 | 0.1 uF paper, 400 v. | working | |
| LI, 2, 3 | Aerial Coil 16-20 mei | tres 9852 | R2 | 20,000 ohms, 1 wat | C3 | 12-430 uuF tuning |
C
|
8 uF 525 P.V. Electro | ytic | |
| LI, 2, 3, | Acrial Coil 20 25 mot | 120 00E3 | 22 | 32,000 ohms, ½ wat | 53 | 200 uuF mica | C44 |
Ducon
04E maner 200 v |
||
| LI, 2, 3, | 4, 5 | 7007 6011 |
t
2 |
[2.32000 in paral | el) | 5° | 13-37 uuf Air Trimmer | C45 | 0.5 uF paper, 400 v. | working |
| Aerial Coil 25-31 me | stres 9852 | R5 | I megohm, 4 watt | 26 | 13-37 uuF Air Trimmer | C46 | 50 uuF mica | 1 | ||
| L6, 7 | Aerial Coil 31-83 mei | tres 9854 | R6 | I megohm, 🖞 watt | C1 | 1-25 uuF Air Trimmer | C47 | 0.02 paper, 600 v. wo | rking | |
| L6, 7, 8 | Aerial Coil 75-200 | R7 | 1.6 megohms, ½ wa | + |
08
08 |
490 uuF mica + 2 4 % | C48 | 0.005 uF paper, 600 | ||
| metres | 9854 | R8 | 0.1 megohm, ½ wat |
ී
රී |
I-25 uuF Air Trimmer | ( | working | |||
| LY, IU | Aerial Coil Broadcast |
К9
2.0 |
20,000 ohms, I wat | CIO | 12-430 uuF Tuning | 0.1 uF paper, 400 v. | working | |||
| D E Coll 12 14 motor | 9/48A* | megohm, z watt | 1-25 uuF Air Trimmer | 0.5 uF paper, 400 v. | working | |||||
| LII. 12 | R.F. Coil 16-20 metr |
5 7000
Pec 9853 |
r megonm, volume
Control |
10031 | 42 uuF N/50 lemp. Comp. | 3 | 23 ar 40 r.v. Electro | איוכ | ||
| LII, 12, | 13 | RI2 | 2.5 meachms. 4 wa |
2
7
7 4 |
1-25 uur Air Irimmer
1-25 uuf Air Trimmer |
C52 | 0.1 uF paper, 400 v. | working | ||
| R.F. Coil 20-25 metr | es 9853 | R13 | 20 ohms, I watt, wii | e wound | CI5 | 2550 uuF mica + 24% | C53 | 16 uF 525 P.V. Electr | olytic | |
| LII, 12, | 13, 14- | R14 | 20 ohms, 1 watt, wii | e wound | CI6 | 1350 uuF mica + 24% | - | Ducon | ||
| - | R.F. Coil 25-31 meth | es 9853 | RI5 | II ohms, I watt, wii | e wound | C17 | 0.1 uF paper, 400 v. working | C54 | 0.05 uF paper, 200 v. | |
| L15 | R.F. Coil 31-83 metre | 9s 9855 | R16 | 20 ohms, I watt, wii | e wound |
CI8
CI8 |
70 uuF mica | working | ||
| LI5, 16 | R.F. Coil 75-200 met | res 9855 | R17 | 0.5 megohm, ½ watt | CI9 | 200 uuF mica | C55 | 0.5 uF paper, 400 v. | ||
| LI/, 18 | K.F. Coil Broadcast | 4 | 8 2 | 1.6 megohms, ½ wa | ± : | C20 | 50 uuF mica | working | ||
| 00 | 1500-540 kc. | 9749A* | 212 | 0.25 megohm, + wa | ŧ | C2I | 52 uuF mica + 2 uuF | C56 | 0.5 uF paper, 400 v. | |
| L19, 20 | Uscillator Coil 13-16 | 50,000 onms, 2 watt | C22 | 12-430 uuF Tuning 183 | 80 | working | ||||
| metres | 4/4/ | CZ3 | 200 uur mica | C57 | 200 uuF mica | • | ||||
| L21, 22 | Oscillator Coil 16-20 |
727
D23 |
bu,uuu onms, I war | 10001 | C24 | I-25 uuF Air Irimmer | C58 | .0025 paper, 600 v. | ||
| metres | 9746 | R23 | I megonm, ione Co | ntrol 17731 | C25 | I-25 uuF Air Irimmer | working | |||
| LZ3, 24 | Uscillator Coil 20-25 | R 25 | 5 000 ohme i wali | 1-25 UUF AIr Irimmer | C60 | 200 uuF mica | ||||
| metres | 9745 | R26 | 0.1 meanhm + 5% | ttem | | 1-25 UUF AIr Irimmer | • | ||||
| 07 '071 | Uscillator Coll 25-31 | T | R27 | 50.000 ohms. I watt |
(7)
(2) |
0.05 it hand 200 v. working | TRANSFORMERS. | |||
| 1 27 28 | 7/44 | R28 | 0.1 megohm ± 5% | . I watt | 130 | 70 mile silvered mice | Ţ | Power Transformer 50 | ||
| metres | 6743 | R29 | 0.5 megohm ± 5% | , I watt | 200 | 70 mF silvered mice | cycles | 11344 | ||
| 1 29 30 | P . | R30 | 10,000 ohms, ½ wai | + | 50 | 12 | Loudspeaker Transforme | |||
| metres | 9742 | R31 | 400 ohms, 3 watt | 232 | 0.01 uE naper 600 v working | (802-G) | TX5 | |||
| 131 32 | Oscillator Coil Broad | cact | wire wound | C34 | 8 "F 535 PV Flactrolvtic | T2 | Loudspeaker Transform | er | ||
| 1500-540 kc. | 974IA* | 0.5 megohm + 5% | , I watt | (802-GY) | TX36 | |||||
| L33. 34 | lst I.F. Transformer | 82867 | 207 | 10,000 onms, 2 war | - | C35 | 0.1 uF paper. 400 v. working | |||
| L35, 36 | 2nd I.F. Transformer | 8287Z | R35 | 20 000 ohms 1 wat |
-
- - |
C36 | 70 uuF silvered mica | LOUDSPEAKER. | ||
| L37 | Speaker field 1500 ohm | Š | R36 | I megohm. I watt | C37 | 70 uuF silvered mica | 12-inch Electro Magne | - | ||
| (802G) | R37 | 0.25 medohm. 4 wa | +- | C38 | 100 uuF mica | ACIO | ||||
| L37 | Speaker field 1100 ohn | JS | R38 | 1/2 meg., 1 watt | C39 | 100 uuF mica | 12-inch Electro Magne | 0100 | ||
| (802-GY) | R39 | l meg. † watt | C40 | 0.02 uF paper, 600 v. working |
-
|
(802-GY) | AS19 | |||
| * NOTE: FI | equency o | coverage of the 802- | G Broadcast k | and is 1500 | )-550 kc. | |||||
| NOTE: AI | I models | 302-G and early mod | els 802-GY use | ed a phono | input circuit with different ve | lues, i.e.:- | • | |||
| R10 = | l megohm. | • | ||||||||
|
R38
828 |
0.5 megohm. | |||||||||
| 001 uF 600 v worl | ina | |||||||||
| C66 | not used. | • |
CONNECTION TO POWER SUPPLY
The receiver should not be connected to any circuit supplying other than alternating current from 200 to 260 volts and at the frequency stated on the label within the cabinet. The power supply connection panel is shown in the accompanying diagram, and for 230 to 260 volt operation the input leads from the power switch S3 and phono motor should be connected to tags B and G. For operation on voltages below 230, connection should be made to tags B and W.
"SERVICE WINDOW."
A "Service Window" is provided in the base of the table model cabinet and in the chassis board of the combination The "window" is normally covered with a perforated arille fastened by four knurled nuts. With the grille removed, it is possible to perform most service operations without removing the chassis from the cabinet
TUNING DRIVE CORD REPLACEMENT.
The accompanying diagram shows the route of the cord and the method of attachment. Whilst fitting the cord. keep it taut and adjust the length so that the tension spring measures approximately 2 inches long when fitted.
DESCRIPTION OF TUNING CIRCUIT ADJUSTMENTS
BROADCAST BAND
The broadcast band adjustments follows usual practice with three trimming capacitors-C7 aerial, C27 R.F., C11 oscillator and a variable magnetite core for L.F. adjustment of the oscillator coil L31, L32.
9.7-3.6 Mc. BAND.
Adjustments are the same as those used on the broadcast band, that is, with three trimming capacitors—C6 aerial, C26 R.E., C13 oscillator and a variable magnetite core for L.F. adjustment of the oscillator coil 1.27, 1.28.
40-15 Mc BAND
All capacitors in the aerial and R.F. sections are common with those in the 9.7-3.6 Mc. band, the change of band being accomplished by switching tapped coils. The oscillator section, however, is provided with a separate capacitor. CI4, for tracking with the signal circuits at the H.F. end and a variable magnetite core for L.F. adjustment of the oscillator coil L29, L30.
22.3-17.7 Mc. BAND.
At the L.F. end of this band there are three adjustments, a magnetite core in the oscillator coil L19, L20 and trimming capacitors C24 R.F. and C4 aerial. Small capacitors. CL C21 and C12, are used in series with the ganged tuning capacitors to accomplish band-spreading at the L.F. end of this band. The oscillator circuit is made to track with the signal circuit at the H.F. end by adjustment of capacitor C9. The three series capacitors are chosen to give three point tracking between the signal and oscillator circuits.
The spring should be sheathed to prevent it from rattling equinst the drum.
LOUDSPEAKER SERVICE
It is inadvisable to attempt loudspeaker repairs other than adjustment of the voice coil and replacement of the transformer. The fitting of a new cone or the replacement ment of a field winding should be done only by Service Departments suitably equipped to do the work.
To centre the voice coil, first remove the dust cover. To do this, use a sharp razor blade and cut the centre out of the dust cover, cutting just inside the edge of the voice coil former, which can be felt with the forefinger. Do not attempt to tear the cover from the cone. Loosen the suspension screws, insert three narrow paper "feelers" in the gap and re-tighten the suspension screws. The "feelers" should be approximately 3-16 inch wide and 0.006 inch thick
After adjusting, test the loudspeaker, and, if satisfactory, fasten a replacement dust-cover in place with latex rubber cement. See "Mechanical Replacement Parts"
19.0-15.0 Mc. BAND.
The capacity system is the same as for the 22.3-17.7 Mc. band, the change of band being accomplished by switching coils, the oscillator coil L21, L22 being fitted with a variable magnetite core for L.F. adjustment.
15.0-11.7 Mc. BAND.
Adjustments are similar to those on the 22.3-17.7 Mc. band, excepting that no H.F. adjustment is provided for the oscillator. L.F. adjustments are trimming capacitors C25 R.F. and C5 aerial and a variable magnetite core in oscillator coil L23, L24.
12094 Ma RAND
One adjustment only is provided, a variable magnetite core in the oscillator coil 125 126
It will be noted that the ratio max. frequency min frequency is the same on the four bands, 12.0-9.4 Mc., 15.0-11.7 Mc., 19.0-15.0 Mc., 22.3-17.7 Mc., and the tracking is practically correct, using the same series capacitor for all hands. The ratio max. frequency is also the same on the 4.0-1.5 Mc. and
9.7-3.6. Mc. bands, but, due to the greatly different fre-'quency spectrum of the oscillator, the series capacitors in the two oscillator circuits are different
CIRCUIT DIAGRAM---Models 802-G and 802-GY
TUNING CIRCUIT DIAGRAM.
411-1, 709-C, 802-C & 802-CY
CIRCUIT DIAGRAM---Models 611-T and 709-C
THIS DIAGRAM SUPERSEDES EXISTING 611-T, 709-C, 802-G & 802-GY TUNING CIRCUITS
TUNING CIRCUIT DIAGRAM
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