TECHNICAL INFORMATION AND SERVICE DATA
MODELS 610-T AND 708-C
SIX VALVE, SEVEN BAND, BATTERY/ VIBRATOR OPERATED SUPERHETERODYNES
ISSUED BY
AMALGAMATED WIRELESS (A/SIA.) LTD.
ELECTRICAL SPECIFICATIONS.
FREQUENCY RANGES:
| (1) 1500-550 kc. | (200-545 M.) | |
| (2) 4.0-1.5 Mc. | (75-200 M.) | |
| (3) 9.7-3.6 Mc. | (31.0-83.4 M.) | |
| (4) 12.0-9.4 Mc. | (25.0-31.9 M.) | |
| (5) 15.0-11.7 Mc. | (20.0-25.7 M.) | |
| (6) 19.0-15.0 Mc. | (15.8-20.0 M.) | |
| (7) 22.3-17.7 Mc. | (13.5-16.9 M.) |
INTERMEDIATE FREQUENCY ....................................
BATTERY COMPLEMENT:
There are two modes of operation—one employing "B" batteries and a 2-volt accumulator, and the other a Vibrator Power Unit, type 17770, powered from a 6-volt accumulator.
Battery cables are available, fitted with telephone tips for "B" batteries fitted with Fahenstock clips, or with plugs for socket-type batteries.
The batteries used and their respective cables are as follows:---
| Battery Operation: |
Cable with
Tips. |
Cable with
Plugs. |
|---|---|---|
| I—2-volt accumulator | . — | |
| 3—45-volt "B" batteries | . 19793 | 19799 |
| I-4.5-volt "C" bias battery | - |
NOTE: An additional 4.5-volt "C" battery is used to provide dial illumination. A lead, part No. 19682 is supplied with the "B" battery cable for connecting this battery see diagram, "Battery Connections."
Vibrator Power Unit Operation:
I-6-volt Accumulator and Vibrator Power Unit, 17770.
BATTERY CONSUMPTION (Without Dial Lamps).
Battery Operation:
2-volt "A" battery—0.84 Amp. 135-volts "B" battery—17-20 mA.
Vibrator Operation ..... I.I Amps.
DIAL LAMPS (3) ..... 6.3 volt, 0.25 Amp.
FUSE:
| Battery Operation | |
|---|---|
| Vibrator Operation | |
| ALVE COMPLEMENT: | |
| (1) IM5G R.F. Amplifier. | |
| (2) IC7G Converter. | and the second |
| (3) IM5G I.F. Amplifier. | |
| (4) IK7G Detector, A.V.C | . and A.F. Amplifier. |
| (5) IK7G Driver. | |
| (6) IJ6G ''B'' Class Outp | ut. The providence of the second second |
| BRATOR | AWA-OAK Type V5124 |
| DUDSPEAKER (Permanent Mag | net): |
| Model 610-T. | Model 708-C. |
| 7-inch—Code No. AY22. | 12-inch—Code No. AUI3. |
| Transformer-XAII. | Transformer—TX5. |
|
V.C. Impedance—3 ohms N
at 400 C.P.S. |
/.C. Impedance—2.2 ohms
at 400 C.P.S. |
| Undistorted Power Output | 1.5 watts |
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 the four cores L19, L21, L23 and L25, after a station of known frequency is received.
The correct procedure is as follows:
- 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.
VIBRATOR POWER UNIT No. 17770.
Operating from a 6-volt accumulator, the Vibrator Power Unit supplies the correct socket voltages for the receiver. It contains a plug-in vibrator, step-up transformer, an efficient filter system and a 5-amp. fuse, which is located within the unit.
The unit is connected to the receiver by means of a cable and plug. See "Battery Connections" diagram.
To remove the Vibrator Unit from the cabinet, disconnect the cable from the receiver and unscrew the three holding screws which pass through the base of the cabinet.
CHASSIS REMOVAL AND REPLACEMENT.
(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 loudspeaker and battery or vibrator cables.
- (3) Disconnect the dial pointer from the drive cord, first unscrewing the thumb nut, and disconnect the cable from the loudspeaker.
- (4) Disconnect the Bowden cable, which actuates the band indicator on the dial scale. The cable is connected to the dial assembly at two points, the sheath to the top left-hand corner of the dial assembly (viewed from the rear) and the core to the band indicator. Loosen the thumb screws at these points and carefully free the cable from the assembly.
- (5) The chassis is held in the cabinet by four bolts. Remove these and withdraw the chassis from the cabinet.
-
(6) Replacing the chassis in the cabinet is a direct reversal of the above instructions, but care must be taken to connect the dial pointer to the drive cord as follows:—
- (a) Turn the tuning control to bring the ganged capacitor plates into full mesh.
- (b) Connect the dial pointer to the drive cord with the pointer in a position opposite the setting mark on the dial scale, which is approximately 5/16 inch to the right of the 550 kc. calibration point.
"SERVICE WINDOW."
A "Service Window" is provided in the base of the table model cabinet. The "window" is normally covered with a perforated grille 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 two inches long when fitted. The spring should be sheathed to prevent it from rattling against 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 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 very 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."
VIBRATOR
T70
MECHANICAL REPLACEMENT PARTS.
| ltem. | Part No |
|---|---|
| Cabinet, console | C69 |
| table | C67 |
| Cable, band indicator | 19150 |
| Cable, loudspeaker— | |
| AY22 | 15359 |
| AU13 | 17826 |
| Cable, pick-up | 17725 |
| Cable, "B" battery— | · |
| With plugs | 1979 9 |
| With tips | . 19793 |
| Cable, "C" battery | 17773 |
| Cable, dial lamp | 19682 |
|
Chassis-end, right-hand
left-hand |
|9080
|782| |
| Clip, grid | . 7459 |
| Cone assembly, loudspeaker— | |
| AY22 | 935 6 |
| AU13 | 10370 |
| Core, magnetite— | |
| Small | 11403 |
| Large | 11400 |
| Dial frame assembly | 19082 |
| Dial scale | 19100 |
| Drum, band indicator | 19094 |
| Drum, drive | 9090 |
| Dust cover, loudspeaker | |
| AY22 | 9843 |
| AU13 | 10306 |
| Knob | 4589 |
| Knob, range switch | 5486 |
| ltem. | Part No. |
|---|---|
| Knob tuning | 8075 |
| Mount plate assembly, tuning drive | 17816 |
| Pulley, brass | 7885 |
| Screen, I.F. transformer | 3351 |
| cap | 837 2 |
| Screen, valve | 8147 |
| cap | 8148 |
| register | 4733 |
| Socket, dial lamp | 4194 |
| Socket valve | 4704 |
| Socket, valve, cushion | 7326 |
| Spindle, tuning drive | |
| Console | 9812 |
| Table | 17739 |
| Spindle, range switch extension— | |
| Console | 19584 |
| Table | 19066 |
| Spindle, tuning control extension | 19583 |
| Spring, band indicator | 8364 |
| Spring, drive tension | 6641 |
| Strip, tag—I way | 7628 |
| 2 way | 8021 |
| 3 way | 9877 |
| 7 way | 9879 |
| VIBRATOR POWER UNIT No. 17 | 770. |
| Cable, battery | 17768 |
| Socket, vibrator | 8498 |
| Strip, tag, 2 way | 8570 |
MECHANICAL SPECIFICATIONS.
| Height. | Width. | Depth. | Overall Chassis Height 9 | |
|---|---|---|---|---|
| Cabinet Dimensions (inches)— | • | Weight (nett lbs.)— | ||
| Table | 12 | 26 | П | Table |
| Console | 32 1 | 33 | 13 | Console |
| Chassis Base Dimensions (inches) | 31 | 16 |
7
|
Cabinet Finish Walnut Venee |
BATTERY CONNECTIONS.
CIRCUIT ARRANGEMENT.
IM5G - R.F. AMPLIFIER.
The IM5G is a super control R.F. pentode, and is utilised for this purpose. The output of the aerial coil, which is tuned by the aerial section of the ganged tuning capacitor, is applied to the control grid for amplification. The anode of this valve is coupled to the control grid of the IC7G via the R.F. coil.
IC7G - CONVERTER.
The IC7G is a pentagrid converter and is employed as a frequency converter. Local oscillations are provided by the oscillator section (grids I and 2).
The oscillator operates in a tuned grid feed back circuit, comprising oscillator coil, padder capacitor and oscillator section of the ganged tuning capacitor. The circuit constants are so designed that the resultant heterodyne frequency to which the output is tuned is 455 kc.
IM5G - I.F. AMPLIFIER.
A second IM5G is used as an I.F. Amplifier. The output from the converter is applied to the control grid via the first I.F. transformer, which is adjusted to a frequency of 455 kc. by means of the magnetite cores. The resultant amplified voltage from this stage is applied via the second I.F. transformer to one diode of the first IK7G for rectification.
IK7G - DETECTOR, A.V.C. AND A.F.
The IK7G is a duo diode pentode employed as detector, A.V.C. and audio amplifier. One diode acts as the signal detector, the other as A.V.C. detector, and the pentode section as the A.F. amplifier.
IK7G - DRIVER.
A second stage of audio frequency amplification is obtained by utilising another IK7G connected as a triode, the diodes being earthed. The output of this valve is fed to the primary of the audio transformer.
IJ6G - OUTPUT.
The secondary of the audio transformer is coupled to each grid of the IJ6G, which is a class B twin triode amplifier. Under these conditions, maximum economy of current is obtained with negligible distortion.
BIAS ARRANGEMENT.
Battery Operation. —A 4½-volt bias battery is used, 4½ volts being applied to the grid circuit of the IK7G driver, 3 volts to the IJ6G, and 1½ volts to the remaining valves.
Vibrator Operation.—Negative bias is obtained by arranging the valve filaments in such an order that the optimum necessary bias is obtained for each valve. All grids are returned to the chassis, which is negative with respect to the negative filament, thus giving the grid a bias voltage of the potential between the negative filament and chassis.
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 12,500 ohms and a range of 5-3,000 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 1,000 kc. 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 1.000 kc. position, a spurious image signal can generally be obtained by turning the tuning control of the receiver to a point approximately 100 kc. 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 iig 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
* 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 noninductive resistor in series with the active output lead.
ALIGNMENT TABLE.
|
Align-
ment Order. |
Test Inst.
Connect to Receiver. |
Frequency
Setting. |
Band
Setting. |
Calibration
Scale Setting. |
Circuit to
Adjust. |
Adjustment
Symbol. |
Adjust to
Obtain. |
|---|---|---|---|---|---|---|---|
|
1
2 3 4 5 6 7 |
IC7G Cap*
IC7G Cap* IC7G Cap* IC7G Cap* IC7G Cap* Aerial Aerial |
455 kc.
455 kc. 455 kc. 455 kc. 600 kc. 1500 kc. 1450 kc. |
Broadcast
Broadcast Broadcast Broadcast Broadcast Broadcast Broadcast |
0°
0° 0° ck 1, 2, 3 and 19° 168° 158° |
2nd I.F. Trans.
2nd I.F. Trans. 1st I.F. Trans. 1st I.F. Trans. 4 Oscillator† Oscillator Radio Frequency |
Core L36
Core L35 Core L34 Core L33 Core L31 C13 C26 |
Max. Peak
Max. Peak Max. Peak Max. Peak Calibration Calibration Max. Peak |
| 8 | Aerial | 1450 kc. | Broadcast | 158° | Aerial | CI | Max. Peak |
|
9
10 11 12 13 14 15 16 17 18 19 20 21 |
Aerial
Aerial Aerial Aerial Aerial Aerial Aerial Aerial Aerial Aerial Aerial Aerial |
17.8 Mc.
17.8 Mc. 17.8 Mc. 21.0 Mc. 15.2 Mc. 11.8 Mc. 11.8 Mc. 11.8 Mc. 9.5 Mc. 9.0 Mc. 9.0 Mc. 9.0 Mc. 4.0 Mc. |
Recheck
22.3-17.7 Mc. 22.3-17.7 Mc. 22.3-17.7 Mc. 19.0-15.0 Mc. 15.0-11.7 Mc. 15.0-11.7 Mc. 15.0-11.7 Mc. 15.0-11.7 Mc. 15.0-11.7 Mc. 15.0-11.7 Mc. 9.7-3.6 Mc. 9.7-3.6 Mc. 9.7-3.6 Mc. 9.7-3.6 Mc. 9.7-3.6 Mc. 9.7-3.6 Mc. 9.7-3.6 Mc. |
5, 6, 7 and
18° 18° 149° 27° 25° 25° 25° 25° 25° 25° 156° 156° 156° 19° 3, 19° 20 and |
8
Oscillator Radio Frequencyt Aerial Oscillator Oscillator Oscillator Radio Frequencyt Aerial Oscillator Radio Frequencyt Aerial Oscillator |
Core L19
C28 C4 C15 Core L21 Core L23 C29 C6 Core L25 C21 C30 C8 Core L27 |
Calibration
Max. Peak Calibration Calibration Calibration Max. Peak Max. Peak Calibration Max. Peak Max. Peak Max. Peak Calibration |
|
22
23 |
Aerial
Aerial |
1.6 Mc.
3.7 Mc. |
4.0-1.5 Mc.
4.0-1.5 Mc. Reche |
15°
153° ck 22 and 23 |
Oscillator
Oscillator |
Core L29
C22 |
Calibration
Max. Peak |
Finally, recheck broadcast band. This is necessary only if the setting of CI5 has been altered †Rock the tuning control back and forth through the signal.
*With arid 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.
IUNING CIRCUIT DIAGRAM.
| Valve. |
Bi
Vo |
as
olts. |
Scr
Vo |
een
Its. |
Scr
Cur |
een
rent. |
An
Ve |
ode
olts. |
And
Curi |
ode
rent. |
ہ :
10 - |
Filan
Vo |
nent
Its. |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Β. | v. | Β. | ۷. | Β. | ٧. | Β. | ۷. |
Β. |
۷. | Β. | ۷. | |||||||
| IM5G | R.F. Ampl | ifier | *_1.5 | 0 | 60 | 65 | 0.6 | 0.6 | 135 | 150 |
1.8 |
2.3 |
r in
Th |
2.0 | 2.0 | |||
| IC7G | Converter, | M.W. | -1.5 | _2.0 | 50 | 57 | 1.8 | 2.0 | 135 | 150 | 1.8 | 1.0 |
načis
Jač |
2.0 | 4.0 | |||
| s.w. | _1.5 | _2.0 | 53 | 62 | 1.4 | 1.6 | · . · | 135 | 150 | 2.2 | 1.6 | 2.0 | 4.0 | |||||
| , | Oscillator, | M.W. | · |
,
|
,
|
· · | 60 | 68 | 2.0 | 2.5 | 1 | ' | ||||||
| s.w. | , | · | ÷. ; ; | 123 | 145 | 3.2 | 4.0 |
·
|
||||||||||
| IM5G | I.F. Ampli | ifier | *_1.5 | 0 | 60 | 65 | 0.6 | 0.6 | 135 | 150 | 1.8 | 2.3 | 2.0 | 2.0 | ||||
| IK7G | Detector | ••••• | _1.5 | 2.0 | 30 | 48 | 0.12 | 0.14 | 60 | 75 |
0.25 |
0.25 | 17 | 2.0 | 4.C | |||
| IK7G | Driver | · . | _4.5 | _4.0 |
.
|
- | ν. | 133 | 150 | 2.0 | 2.5 |
1
. 5 |
2.0 | 6.C | ||||
| IJ6G | Output | _3.0 | _4.0 | · ··· | 135 | 150 | 3.5 | 2.5 | 2.0 | 6.0 |
SOCKET VOLTAGES
Measurements taken with 1000 ohms/volt meter, no signal input, and Volume Control in maximum
clockwise position.
Filament volts are from positive filament connection to chassis.
*_1.5 volts bias on Medium Wave, and 75-200 M. bands only.
Zero bias condition on remaining bands.
DESCRIPTION OF TUNING CIRCUIT ADJUSTMENTS
Broadcast Band.
The broadcast band adjustments follow usual practice with three trimming capacitors—CI aerial, C26 R.F., C13 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—C8 aerial, C30 R.F., C21 oscillator and a variable magnetite core for L.F. adjustment of the oscillator coil L27, L28.
4.0-1.5 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, C22, for tracking with the signal circuit 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 C28 R.F. and C4 aerial. Small capacitors C2, C27 and C12 are used in series with the gang 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 C15. The three series capacitors are chosen to give three point tracking between the signal and oscillator circuits.
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 C29 R.F. and C6 aerial and a variable magnetite core in oscillator coil L23, L24.
12.0-9.4 Mc. Band.
One adjustment only is provided, a variable magnetite core is the oscillator coil L25, L26.
It will be noted that the ratio max. 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 bands. The ratio max. frequency min. frequency is also the same on the 4.0-1.5 Mc. and the 9.7-3.7 Mc. bands, but, due to the greatly different frequency spectrum of the oscillator, the series capacitors in the two oscillator circuits are different.
CIRCUIT DIAGRAM
CIRCUIT CODE
610-Т & 708-С
|
Circuit Stock Code
Code No. Description. or Part No. |
Circuit
Code N |
o. Description, or Part No. |
Circuit
Code No |
Description | Stock Code |
|---|---|---|---|---|---|
| Description. | or Part No. | ||||
| INDUCTORS. | R20 | 0.2 megohm, 1 watt | C43 · | 0.1 uF paper, 400v. | |
| LI, L2 Aerial Coil, 22.3-17.7 Mc. 9852 | R21 | 600, 527 or 600, 727 | working | 228, 121 | |
|
LI, LZ, L3
Aprial Cail 19.0 LE 0 May 0052 |
NZ1 | 600 515 or 600 715 | 70 uuF silvered mica | 226, 460 | |
| LI. 12. 13. 14 | R22 | 0.5 megohm, 분 watt | C45 | 10 uur silvered mica | 226, 460 |
| Aerial Coil, 15.0-11.7 Mc. 9852 | 600, 535 or 600, 735 | C47 | 110 uuF mica | 132111 | |
| LI, L2, L3, L4, L5 | R23 | 0.1 megohm, Tone Con- | C48 | 0.5 uF paper, 400v. | 102111 |
| Aerial Coil, 12.0-9.4 Mc. 9852 | D24 | trol 19007 | working | 228, 135 | |
| Lo, L/ Aerial Coil, 9./-3.6 Mc. 9854 | 127 | wound | C49 | 0.02 uF paper, 600v. | 220 207 |
| L9, L10 Aerial Coil, Broadcast 9748 | R70 | 400 ohms, ½ watt 600, 273 | C50 | 0.1 uE paper 400v | 228, 307 |
| LII R.F. Coil, 22.3-17.7 Mc. 9853 | R71 | 100 ohms, 1 / 2 watt 600, 261 | e fai s | working | 228, 121 |
| LII, LI2 R.F. Coil, 19.0-15.0 Mc. 9853 | R72 | 100 ohms, ½ watt 600, 261 | C51 | 50 uuF mica | 13211† |
| 1. | CARACITORS | C52 | 200 uuF mica | 13211† | |
| 111 112 113 114 | C54 | 228, 307 | |||
| R.F. Coil, 12.0-9.4 Mc. 9853 | 1-25 uuF air frimmer 19659 | working | 228 135 | ||
| LI5 R.F. Coil, 9.7-3.6 Mc. 9855 | 02 | C55 | 8 uF, 525 P.V. elec- | 220, 155 | |
| L15, L16 R.F. Coil, 4.0-1.5 Mc. 9855 | C3 | 12 uuF mica 13211† | trolytic | ET1015 | |
| L17, L18 (R.F. Coil, Broadcast 9749 | C4 | I-25 uuF air trimmer 19659 | C56 | 0.035 uF paper, 600v | |
| Mc. 9747 | C5 | 12 uuF mica 13211† | C57 | 0.005 uE paper 600. | 228, 311 |
| L21, L22 Oscillator Coil, 19.0-15.0 | 1-25 uuf air frimmer 19659 | working | 228 295 | ||
| Mc. 9746 | C8 | 1-25 uuF air trimmer 19659 | C58 | 0.005 uF paper, 600v. | |
| L23, L24 Oscillator Coil, 15.0-11.7 | C9 | 200 uuF mica |321|† | 0.50 | working | 228, 295 |
|
Mc. 9/45
125 126 Oscillator Coil 12.0.94 |
CIO | 12-430 uuF variable tun- | C59 | 400 uF, 12 P.V. elec- | ET LO (C |
| Mc. 9744 | ing (ganged) 9872 | C60 | E11045 | ||
| L27, L28 Oscillator Coil, 9.7-3.6 | working 228 [2] | working | 228, 121 | ||
| Mc. 9743 | C12 | 42 uuF Temp. Comp. N750 | C61 | 450 uuF mica | 13212† |
| Mc. 9742 | C13 | 11-29 uuF air trimmer 3411B | C62 | 25 uF, 40 P.V. elec- | |
| L31, L32 Oscillator Coil, Broadcast 9741 | C14 | 12-430 uuF variable tun- | C63 | 400 UF 12 PV alas | E110769 |
| L33, L34 Ist I.F. transformer | CI5 | 2-10 uuF air trimmer 3658 | trolytic | FT1045 | |
| 8286-Z, 8282* | C16 | 490 uuF mica ± 2½% 13212† | C64 | 0.5 uF paper, 400v. | 21.1010 |
| 8287-7: 8281* | CI7 | 0.05 uF paper, 400v. | CAS | working | 228, 135 |
| L37 Low tension R.F. filter | C18 | working 228, 115 | 000 | working | 228 125 |
| choke 3149 | working 228 121 | C66 | 400 uF, 12 P.V. elec- | 120, 155 | |
| Low tension A.F. filter | C19 | 50 uuF mica 13211† | 070 | trolytic | ET1045 |
| L70 R.F. Choke 3036 | C20 | 0.1 uF paper, 400v. | 10/0 | 0.5 uF paper, 400v. | 220 125 |
| L71 Smoothing Choke 8321 | C21 | 228, 121 | C71 | 300 uuF mica | 228, 135 |
| L72 R.F. Choke 3036 | C22 | 11-29 uuF air trimmer 3411B | C72 | Not used. | 132111 |
| L/3 R.F. Choke 3149 | C23 | 2550 uuF mica ± 23% 13213† | C73 | 8 uF, 525 P.V. elec- | |
| L/4 K.F. Choke 3149 | C24 | 1350 uuF mica + 2½% 13213† | CTA |
trolytic 0.01 wE means (00) |
EE0849 |
| RESISTORS. | C25 | 0.1 uF paper, 400v. | working | 228 301 | |
| RI I megohim + watt 600 341 | C26 | working 228, [2] | C75 | 0.02 uF paper, 600v. | 220, 301 |
| R2' 30,000 ohms, I watt | C27 | 52 uuF mica -+ 2 uuF | working | 228, 307 | |
| 600, 511 or 600, 711 | C28 | 1-25 uuF air trimmer 19659 | C/6 | U.UI uF paper, 600v. | 220 221 |
|
R3 500 ohms, ½ watt 600, 275
R4 50,000 ohms 1 watt 600, 215 |
C29 | 1-25 uuF air trimmer 19659 | C77 | 0.02 uF paper. 600v | 228, 301 |
| R5 | megohm, 1 watt 600, 315 | C30 | 1-25 uuF air trimmer 19659 | working | 228, 307 | |
| R6 40,000 ohms, I watt | C32 | 12-430 uuF variable | C78 | 0.25 uF paper, 400v. | |
| 600, 513 or 600, 713 | tuning (ganged) 9872 | s set i é | working | 228, 129 | |
| R/ 500 ohms, 1 watt 600, 275 | C33 | 70 uuF mica 13211† | TRANSFORMERS. | ||
| R9 20,000 ohms, ½ watt 600, 275 | C34 | 0.1 uf paper, 400v. | TI | Push Pull Input | 36280 |
| R10 50,000 ohms, 1 / 2 watt 600, 315 | C35 | 0.05 µE paper 400y | T2 | Loudspeaker (610T) | XALL |
| R11 320 ohms, ½ watt 600, 271 | working 228, 115 | Tee | Loudspeaker (708C) | TX5 | |
| R12 0.1 megohm, ½ watt 600, 321 | C36 | 8 uF, 525 P.V. electro- | 170 | Vibrator | 8319 |
| 600. 517 or 600 717 | C37 | lytic EE10774 | SWITCHES | ||
| R14 50,000 ohms, ½ watt 600, 315 | 0.37 | trolytic | SI | Phono-Rande-8 position | n rotani |
| RI5 0.5 megohm Volume | C38 | 0.01 uF paper, 600v. | (NOTE: Wafers numb | ered from | |
| RIA LA magahar Laurth (00 arr | C 20 | working 228, 301 | 60 | front of chassis.) | - |
| RI7 2.5 meachms. + watt 600, 345 | C39 | 70 uuF silvered mica 226, 460 | 52 | Battery, 1777 | B |
|
R18 1.6 megohms,
|
C41 | 4 uuF mica 226, 460 | FUSES. | • | |
| R19 I megohm, I watt | C42 | 0.01 uF paper, 600v. | FI | 5 Amp. | |
| 600, 541 or 6 00, 741 | working 228, 301 | F2 | ≩ Amp. |
* Part number of winding only.
† Capacitance and tolerance (if shown) to be quoted.
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