TECHNICAL INFORMATION
AND
SERVICE DATA
Models 805-G & 805-GZ
NINE VALVE, SEVEN BAND
A.C. OPERATED SUPERHETERODYNES
ISSUED BY
AMALGAMATED WIRELESS (A/SIA) LTD.
ELECTRICAL SPECIFICATIONS.
FREQUENCY RANGES.
| ۱. | 540-1600 Kc/s. | |
|---|---|---|
| 2. | 4.0-1.5 Mc/s. | |
| 3. | 9.7-3.6 Mc/s. | 31-83.4M. |
| 4. | 12.0-9.4 Mc/s. | 25-31.9M. |
| 5. | 15.0-11.7 Mc/s | |
| 6. | 19.0-15.0 Mc/s. | 15.8-20M. |
| 7. | 22.3-17.7 Mc/s | 13 5-16.9M |
Controls 805-G and 805GZ
-
INTERMEDIATE FREQUENCY .................................... Power Supply Rating .................................... 40-60 C.P.S.
- (Models are produced with other voltage and frequency ratings.) Power Consumption ..... 100 watts Valve Complement
MODEL 805-G.
- 1. 6U7G. R.F. Amplifier.
- 2. 6J8GA. Converter.
- 3. 6G8G. I.F. Amplifier, Detector, A.V.C.
- Ist A.F. Amplifier. 4. 6SJ7
- 5. 6SJ7GT 2nd A.F. Amplifier.
- 6. 6J5GT.
- 7. 6V6GT. Push-pull Output.
-
8. 6V6G Push-pull Output.
-
Rectifier.
- Y61 or Y63. Visual Tuning Indicator.
-
Rectifier.
MODEL 805-GZ
- 1. 6U7G. R.F. Amplifier.
- 2. 6J8GA. Converter
- 3. 6G8G. I.F. Amplifier, Detector, A.V.C.
- 4. 6AU6. Ist A.F. Amplifier, Det 5. 6AU6
- 2nd A.F. Amplifier. Phase Splitter 6. 6J5GT.
- 7. 6V6GT. Push-pull Output
- 8. 6V6GT. Push-pull Output. 9. 5Y3GT. Rectifier.
-
- Y61 or Y63. Visual Tuning Indicator.
Model 805-G. 12 inch permanent Magnet-Code No. AU54 Transformer-TX4. V.C. Impedance-12.5 ohms at 400 C.P.S. Model 805-G.Z. 12 inch permanent Magnet—Code No. AU58. Transformer-TX4. V.C. Impedance-12.5 ohms at 400 C.P.S. Undistorted Power Output-8 watts
Dial Lamps (4)-6.3 volts, 0.25 Amp. M.E.S.
MECHANICAL SPECIFICATIONS.
Cabinet Dimension's (inches)
Chassis Base Dimensions (inches) Weight (nett Ibs.) Cabinet Finish
Height Width Depth 34 156 Walnut Veneer.
ALIGNMENT PROCEDURE.
The receiver is tested by the manufacturer with precision instruments and all adjusting screws are sealed. Re-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 10,000 ohms and a range of 5-6000 milliwatts. The recommended meter is the A.W.A. output meter, type 2M8832.
As the calibration of the band-spread bands require 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/s. 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.
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 an 0.25 megohm resistor is connected between the output terminals, and for short wave alignment a 400 ohm noninductive 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 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/s. band, tune-in the known station, and to shift the pointer position to the high frequency end of the dial, turn L19 clockwise, or vice-versa, until the station can be tuned-in at its assigned frequency.
The adjustments for the 19.0-15.0, 15.0-11.7 and 12.0-9.4 Mc/s. bands are similar, using L21, L23 and L25 respectively.
|
Alignment
Order |
Connect "high" side
of generator to: |
Tune Generator
to: |
Tune Receiver
Dial to: |
Circuit to
adjust. |
Adjustment
Symbol |
Adjust to
obtain. |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
| 2 | 3 | 4 |
6J8GA Cap*
6J8GA Cap* 6J8GA Cap* 6J8GA Cap* |
455 Kc/s.
455 Kc/s. 455 Kc/s. 455 Kc/s. |
540 Kc/s.
540 Kc/s. 540 Kc/s. 540 Kc/s. |
2nd I.F. Trans.
2nd I.F. Trans. 1st I.F. Trans. 1st I.F. Trans. |
Core L36
Core L34 Core L35 Core L33 |
Max. Peak
Max. Peak Max. Peak Max. Peak |
|||||
| Re-check I, 2, 3 and 4. | |||||||||||
|
5
6 7 8 |
Aerial
Aerial Aerial Aerial |
600 Kc/s.
1,500 Kc/s. 1,500 Kc/s. 1,500 Kc/s. |
600 Kc/s.
1,500 Kc/s. 1,500 Kc/s. 1,500 Kc/s. |
| Oscillator**
| Oscillator | Radio Frequency | Aerial |
Core L31
C12 C28 C7 |
Max. Peak
Calibration Calibration Max. Peak |
|||||
| Ū | Re-o | check 5, 6, 7 and | 8. | ||||||||
|
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/s. 11.8 Mc/s. 9.5 Mc/s. 9.0 Mc/s. | 17.8 Mc/s. 11.8 Mc/s. 9.5 Mc/s. 9.0 Mc/s. |
Oscillator
Radio Frequency** Aerial Oscillator Oscillator Radio Frequency** Aerial Oscillator Radio Frequency** Aerial Oscillator Radio Frequency** |
Core L19
C23 C6 C10 Core L21 Core L23 C24 C5 Core L25 C16 C22 C4 Core L27 |
Calibration
Max. Peak Max. Peak Calibration Calibration Max. Peak Max. Peak Calibration Calibration Max. Peak Max. Peak Max. Peak Max. Peak |
|||||
| 2 1 | , | Re-ch | eck 18, 19, 20 an | d 21. | |||||||
|
22
23 |
Aerial
Aerial |
| 1.6 Mc/s.
3.7 Mc/s. Ra |
1.6 Mc/s.
3.7 Mc/s. e-check 22 and 2 |
Oscillator
Oscillator 3. |
Core L29
C17 |
Calibration
Max. Peak |
|||||
| A Design of the second s | |||||||||||
ALIGNMENT TABLE.
Finally, re-check broadcast band. This is necessary only if the setting of C10 has been altered.
*With grid clip connected. An 0.001 uF capacitor should be connected in series with the "high" side of the test instrument. *Rock the tuning control back and forth through the signal.
CONNECTION TO POWER SUPPLY.
Each instrument is supplied ready for use on voltages between 230 and 260 volts inclusive. Should the supply be consistently below 230 volts, it will be necessary to remove the chassis from the cabinet and re-wire the power supply connection panel. The panel has three tags, to which three leads from the power transformer—blue, white and green are connected. For 230-260 volts operation, the cables from the ON/OFF switch and the Phono-motor connection socket are connected to the blue and green leads. For voltages below 230, both should be connected to the blue and white leads. See accompanying diagram.
CHASSIS REMOVAL.
Chassis Removal.
I. Remove the six control knobs by pulling them straight off their spindles.
2. Remove the backs from the receiver and Record Changer compartments.
3. Disconnect the Phono-motor, cabinet pilot lamp and pick-up cables from the chassis, the power cable from the distribution panel situated under the Record Changer compartment, and the loudspeaker cable from the loudspeaker.
4. The chassis is held in the cabinet by four screws, two at each end of the chassis. Removal of these enables the chassis to be withdrawn from the cabinet.
TUNING DRIVE CORD REPLACEMENT.
The accompanying diagram shows the route of the cord and the method of attachment. Whilst fitting the tuning drive cord, keep it taut, and adjust the length so that the tension spring measures approximately 2 inches long when fitted. The spring should be sheathed to prevent it from rattling against the drum.
Wave Change Switch Drive Replacement.
The following notes should be read whilst referring to Fig. 4, which shows the route and method of attachment of both the drive cord and drive wire.
When replacing either the cord or the wire, the recommended procedure is as follows:---
(I) Drive Wire.
Turn the switch to the extreme anti-clockwise position.
Loosen screws "X" and anchor one end of the wire under the self-tapper as shown on drum "C".
Feed the wire under and over bush "F", around drum "C" in an anti-clockwise direction, over pulley "G", around drum "B", through "E" on drum "B" twice, then, around drum "B" in an anti-clockwise direction, over pulley "H", around drum "C", and finally, fasten under and over bush "F" by the locking bracket.
Now adjust screws "X" for correct tension and lock.
(2) Drive Cord.
Tie the cord over "D" on drum "A" so that it measures approximately 17" to the left and 9" to the right of "D".
Feed the long section of the cord anti-clockwise around drum. "A", under pulley "2", and over pulleys "3" and "4". Now feed the short section clockwise around drum "A"
Now feed the short section clockwise around drum "A" and under pulley "I". Tie the 9" section to the tension spring, pass the 17" section through the other end of the spring, and tie after adjusting the tension.
AUDIO SYSTEM-MODEL 805-G.
Ist A.F. Amplifier (V4) -6SJ7. 2nd A.F. Amplifier (V5) -6SJ7GT.
A 6SJ7 value is used as the 1st A.F. Amplifier and Tone Control source.
The action of this arrangement is as follows:-----
At middle frequencies the gain of the valve is determined by the plate load R23, and the negative feedback developed across R22. All values have been arranged so that the normal gain occurs at 400 C/s.
Treble Tone Control (R18).
At high frequencies, the negative feedback is reduced, due to the shunting of the cathode circuit by C48, the amount of shunting being controlled by the setting of R18.
Maximum treble lift occurs when the moving arm of the control is turned fully clockwise. Treble cut is obtained, when the arm of the control is in the extreme anti-clockwise position, due to the shunting effect of C56 across the grid circuit of V5.
Bass Tone Control (R25).
In series with the plate load resistor R23 is R24, which is shunted by C50.
This combination has a new impedance at 400 C/s. The impedance rises as the frequency decreases and the gain rises correspondingly with the impedance. R23 can be effectively short-circuited by the adjustment of the Bass Control (R25). An increase of gain at low frequencies is obtained with the moving arm of the control in the extreme clockwise position. With the moving arm in the extreme anti-clockwise position, C52 is inserted into the coupling circuit and "bass cut" is obtained.
The 6SJ7 employed in this position should have low heater-cathode leakage, otherwise, hum may arise.
The remaining portion of the audio end follows normal
practice of Phase Splitter (6J5GT) and Push-pull Amplifier (2–6V6GT) with 20 db of negative feedback applied betwee input and output via R37, R27.
MODIFICATIONS TO MODEL 805-G.
Hum Reduction.
Cause: Heater-Cathode leakage in the 6SJ7 or 6SJ7GT valves.
This can occur in either valve after a period of service.
Three things should be done to deal with this:-
(1) Wire heaters of V4 and V5 from the special centre tapped heater winding (already used for V4) and reduce the heater voltage by means of series resistance to 5.5 volts.
Two pieces of 32 SWG Eureka wire, 6 inches long, inserted through I mil tubing, in series with each side of the winding are very convenient for this purpose. The centre tap is earthed in the normal position. Refer to Fig. 6.
(2) By-pass the cathode of V4 with a 25/40 Electrolytic capacitor. This increases the overall gain of V4 and therefore, a voltage divider is incorporated in the grid circuit of V5. One-fifth of the available voltage is applied to this grid. See Fig. 7.
The cathode of V5 cannot be by-passed owing to the negative feedback arrangement.
(3) Improve the high tension filtering by adding to the filter unit a TX14 choke and a 16/525 electrolytic capacitor. These are inserted in the rectifier side of the filter as shown in Fig. 8.
As well as the modifications mentioned above, some other changes can be made with advantage. Two miniature valves (6AU6) can be used in place of the 6SJ7 and 6SJ7GT, and the Tone Control circuits can be altered in accordance with Fig. 9. The description of the modified audio system will then be the same as for model 805-GZ.
| VALVES |
Control Grid
to Chassis Volts |
Cathode to
Chassis Volts |
Screen to
Chassis Volts |
Anode to
Chassis Volts |
Anode
Current mA |
Heater
Volts |
|
|---|---|---|---|---|---|---|---|
| 6U7G | R.F. Amp., M.W. | -2.2* | 0 | 85 | 265 | 6.0 | 6.3 |
| S.W. | -2.2* | 0 0 | 85 | 265 | 6.0 | ||
| 6J8GA | Converter, M.W. | -2.2* | 0 | 85 | 265 | 0.8 | 6.3 |
| S.W. | -3.4* | 0 | 85 | 265 | 0.6-1.3 | ||
| Oscillator, M.W. | 0 | 130 | 8.0 | ||||
| S.W | 0 | 130 | 6.0-8.0 | ||||
| 6G8G | I.F. Amp., Det. A.V.C., M.W. | -2.2* | 0 | 85 | 265 | 5.4 | 6.3 |
| S.W. | -2.2* | 0 | 85 | 265 | 5.4 | ||
| 6SJ7 | Ist A.F. Amp. | 1.8 | 18 | 35 | 0.2 | 6.3 | |
| 6SJ7GT | 2nd A.F. Amp. | 3.5 | 58 | 88 | 0.8 | 6.3 | |
| 6J5GT | Phase Splitter | 58 | 95 | 0.7 | 6.3 | ||
| 6V6GT) | Push-pull | 16 | 265 | 258 | 34.0 | 6.3 | |
| 6V6GT∫ | Output | 16 | 265 | 258 | 34.0 | 6.3 | |
| 5Y3GT | Rectifier | - | 680/340 | 5.0 | |||
| Volts A C |
SOCKET VOLTAGES AND CURRENTS. MODEL 805-G.
100 mA Total Current Drain.
*Cannot be measured with an ordinary voltmeter.
Voltage across loudspeaker field—78 volts.
Measured with receiver connected to 240 volts A.C. Supply. No signal input. Volume Control maximum clockwise.
DESCRIPTION OF TUNING CIRCUIT ADJUSTMENTS. Broadcast Band.
The broadcast band adjustments follows usual practice with three trimming capacitors—C7 aerial. C28 R.F., C12 oscillator, and a variable magnetite core for the L.F. adjustment of the oscillator coil L31, L32.
9.7-3.6 Mc/s. Band.
Adjustments are the same as those used on the broadcast band, that is, with three trimming capacitors-C4 aerial, C22 R.F., C16 oscillator, and a variable magnetite core for L.F. adjustment of the oscillator coil L27, L28.
4.0-1.5 Mc/s. Band.
All capacitors in the aerial and R.F. sections are common with those in the 9.7-3.6 Mc/s band, the change of band being accomplished by switching tapped coils. The oscillator section, however, is provided with a separate capacitor. C17. 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/s 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 C23 R.F. and C6 aerial. Small capacitors CL C25 and C13 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
C10. The three series capacitors are chosen to give three point tracking, between the signal and oscillator circuits. 19.0-15.0 Mc/s. Band.
The capacity system is the same as for the 22.3-17.7 Mc/s. 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/s. Band.
Adjustments are similar to those on the 22.3-17.7 Mc/s. band, excepting that no H.F. adjustment is provided for the oscillator. L.F. adjustments are trimming capacitors C24 R.F., C5 aerial, and a variable magnetite core in oscillator coil 123 124
12.0-9.4 Mc/s. Band.
One adjustment only is provided, a variable magnetite core in 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/s., 15.0-11.7 Mc/s., 19.0-15.0 Mc/s., 22.3-17.7 Mc/s., and the tracking is practically correct. using the same series capacitor for all bands. The ratio
max. frequency is also the same on the 4.0-1.5 Mc/s. and 9.7-3.6 Mc/s. bands. but. due to the greatly different frequency spectrum of the oscillator, the series capacitors in the two oscillator circuits are different.
ARRANGEMENT. CIRCUIT
R.F. Amplifier-6U7G (VI).
The 6U7G is a triple grid, super control R.F. Amplifier. The output of the aerial coil, which is tuned to signal freavency by the aerial section of the tuning capacitor, is applied to the control grid for amplification. The cathode being earthed, a minimum negative bias voltage of 2.2 volts in the 805-G and 2.0 volts in the 805-GZ is obtained from the back-bias circuit, and applied to the control grid via the
Amplification is also controlled automatically, due functioning of the A.V.C. Circuit. Converter-6J8GA (V2).
The 6J8GA is a triodeheptode converter and is employed as a frequency converter. Voltages at signal frequency are applied to the control grid from the R.F. Amplifier via the R.F. coil and associate circuit. Local oscillations are provided by the triode portion of this valve operating as a tuned arid feedback circuit comprising oscillator coil, padding capacitor and oscillator section of ganged tuning capacitor. Electronic mixing gives a resultant heterodyne frequency of 455 Kc/s. The cathode of this valve being earthed, bias voltages are applied to the control arid via the A.V.C. line from the back-bias circuit. Minimum bias on medium wave is -2.2 volts and short wave -3.4 volts for model 805-G. For model 805-GZ, bigs on medium wave is -2.0 volts and on short wave -3.1 volts. The 6J8GA is not A V.C. controlled on short wave.
I.F. Amplifier, Detector, A.V.C.—6G8G (V3).
The output from the 6J8GA is coupled to the control grid of the 6G8G by the 1st 1.F. transformer, which is permeability tuned to 455 Kc/s. Bias conditions are similar to those of the R.F. Amplifier (VI).
The 2nd I.F. transformer, permeability tuned to 455 Kc/s., couples the output of V3 to diode No. 2 for detection. Portion of the R.F. voltage from this diade is fed to the diade No. I by coupling capacitor (C37) and a voltage is developed across the diode load resistor (RII). This voltage is applied to the grids of VI, V2 and V3 via the A.V.C. line This voltage so developed varies in proportion to the strength of the carrier being received.
AUDIO SYSTEM-MODEL 805-GZ.
Ist A.F. Amplifier (V4)-6AU6. 2nd A.F. Amplifier (V5)-6AU6.
The heater of V4 and V5 are supplied at a reduced voltage from a special centre-tapped winding to reduce hum to a minimum. The cathodes of both valves are also /by-passed as an additional hum preventative.
Approximately 20 db of negative feedback is applied to the screen of V5 and the tone controls are also operated in a negative feedback arrangement. Under these conditions, a power output of 8 watts, with a negligible percentage of distortion, is obtainable.
OPERATION OF TONE CONTROLS.
Treble Tone Control (R27).
At middle frequencies, approximately 10 db of negative feedback is applied from the plate to the grid of V4.
At high frequencies, when the moving arm of the control is at the extreme anti-clockwise position, R25 is shunted by C55, which has low reactance at high frequencies. Feedback is, therefore, increased, giving "Treble Cut."
With the arm of the control in the extreme clockwise position, R26 is shunted by C56, giving less feedback, and consequently, "Treble Boost."
Bass Tone Control (R28).
Both C53 and C54 are of relatively high reactance at low frequencies.
With the moving arm of the control at the extreme anticlockwise position. C53 is short-circuited, making the negative feedback the same magnitude as at middle frequencies.
'Bass Cut'' is obtained due to the voltage divider action of C54 and the arid resistor of V5 (R29)
With the moving arm of the control in the extreme clockwise position, C54 is short-circuited and the negative feedback at low frequencies is reduced owing to the high react-'ance of C53. This naturally results in "Bass Boost.
R19, in series with the grid of V4, is to prevent the action of the Volume Control (R17) from affecting the feedback arrangements. This resistor is shunted by C48 to increase the high frequency response on "Radio
The remainder of the audio system follows normal practice of Phase Splitter (V6-6J5GT) and Push-pull Amplifier (V7. V8, 2-6V6GT), with 20 db of negative feedback applied between input and output via R24. R30.
SOCKET VOLTAGES AND CURRENTS. MODEL 805-GZ.
| VALVES |
Control Grid
to Chassis Volts |
Cathode to
Chassis Volts |
Screen Grid
to Cha ss is Volts |
Anode to
Chassis Volts |
Anode
Current mA |
Heater
Volts |
|---|---|---|---|---|---|---|
| 6U7G R.F. Amp., M.W. |
-2.0*
-2.0* |
0 |
85
85 |
250 |
6.0
6.0 |
6.3 |
| 6J8GA Converter, M.W. | -2.0* | Ő |
85
85 |
250 | 0.8 | 6.3 |
| Oscillator, M.W. | -5.1 | 0 |
|
140 | 0.8 | |
| 6G8G I.F. Amp. Det., A.V.C., M.W. | -2.0* | 0 | 85 | 250 |
5.4
5.4 |
6.3 |
| 6AU6 Ist A.F. Amp. | -2.0 |
1.8
3.0 |
120* | 140* | 0.6 | 5.3 |
| 6J5GT Phase Splitter | • | 62.0 | 110 | 0.7 |
5.3
6.3 |
|
|
6V6GT Push-pull
6V6GT Output |
16.0 | 250 | 245 | 34.0 |
6.3
6.3 |
|
| 5Y3GT Rectifier |
680/340 V
100 mA To |
olts A.C.
otal Current Drain |
5.0
n |
*Cannot be measured with an ordinary voltmeter.
Voltage across L37-80 volts.
Voltage across L38-15 volts. Measured with receiver connected to 240 volts A.C. Supply. No signal input.
Volume Control Maximum clockwise.
D.C. RESISTANCE OF WINDINGS.
| Winding | D.C. Resistance in ohms |
|---|---|
| Aerial Coils | |
| LI |
. |2
* |
| L2 | · |
| L4 | |
| L5 | * |
| L6 |
-
|
| L8 | - 1.5 |
| L9 | . 2 |
| . 4 | |
| L12 • | 📕 - Angelan Angelan Santa Pangalan Angelan Santa Pangalan Sa |
| LI3 | • |
| LI4 | . * |
| LI5 | - 1.5 |
| 55 | |
| LI8 | . 4 |
| Oscillator Coils | |
| L19 | |
| L20 | |
| L22 | * |
| L23 | |
| L24 | * |
| 126 | * |
| L27 | * |
| L28 | * |
| L29 | 1.25 |
| | 13| | 7 5 |
| L32 | 1.5 |
| I.F. Transformer Winding | 9 |
| Smoothing Choke L37 | 750 |
| Loudspeaker Input | 80 |
| Transformer (TI) | |
| TX4 Primary | . 380 |
| TX4 Secondary | |
| Primary | 13 |
| Secondary | 280 |
| , |
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. *Less than I ohm.
MECHANICAL REPLACEMENT PARTS.
| 8147 | 0110 | 0110 | 24/5/ | 24667 | 4704 | DTQ | 217 | 8027 | 24789 | 10236 | 24790 | 23853 | 5458 | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Screen. Valve | Jocket, Valve, with Screen | (Aluo 70-cng) | Socket, Valve Cushion | Assembly | Socket, Valve, 8 pin | Socket Volve 8 nin | Amphenol | Strip Tag I wav | 4 wov | 4 way | 4 way | 5 way | 5 way | Terminal, Spring | ||||
| Part No. | 23543 | 23561 | 23539 | 23549 | 0000 | 23518 | 25913 | 23852 | 24650 | 25169 | 25167 | 4263 | 17386 | 17387 | 10274 | 4733 | ||
| Item • | 85Z Drum "A" | Drum "B" | Drum "C" | Flywheel Assembly | Panel, Capacitor Assembly | 805-G | 805-G | 805-62 | 805-62 | Panel, Power Cord Assembly | Panel, Pin-Jack Assembly | 2 way | 2 way | 3 way | Register, Valve Screen | |||
| Part No | C85 or C | 23851 | 23983 | 23984 | 23859 | 23855 | 23856 | 23863 | 23857 | 23554 | 23527 | 23528 | 5793 | 23570 | 23536 | 23376A | 0606 . | |
| ltem | Cabinet | Cable, Loudspeaker | Cable, Pick-up | Cable, Power | Cable, Power Switch | Cable, Tone, Bass | Cable, Tone, Treble | Cable, Tunina Indicator | Cable, Volume | Chassis. Base | Chassis, End. Right-Hand | Left-Hand | Clip, Grid | Dial, Frame, Assembly | Dial, Pointer Assembly | Dial, Scale | Drum, Drive | Drum, Wave Change (Fig. 4) |
FIG. 5. TUNING CIRCUIT.
٠
CIRCUIT CODE RADIOLA 805-GZ.
|
Code
No. |
Description Pa | rt No. |
Code
No. |
Description | Part No. |
|---|---|---|---|---|---|
| INDUCTORS | C10 | 1-9 uuF Air Trimmer | 16347 | ||
| L1, 2 | Aerial Coil 13-16 Metres | 9852 |
CII
CI2 |
490 uuF Padder ± 22/₀
2-21 uuF Air Trimmer |
19659 |
| LI, 2, 3 |
Aerial Coil 16-20 Metres
Aerial Coil 20-25 Metres |
9852 | C13 | 42 uuF N750 Temp. | |
| LI, 2, 3, 4, 5 | Aerial Coil 25-31 Metres |
9852
9854 |
CI4 | 2550 uuF Mica ± 21% | |
| L6, 7, 8 | Aerial Coil 75-200 Metres | 9854 |
CI5
CI6 |
2-21 uuF Air Trimmer | 19659 |
| L9, 10 |
Aerial Coil 540-1600 Kc/s
R.F. Coil 13-16 Metres |
9853 | CI7 | 2-21 uuF Air Trimmer | 19659 |
| LII, 12 | R.F. Coil 16-20 Metres |
9853
9853 |
CIB | Working | |
|
LII, 12, 13
LII, 12, 13, 14 |
R.F. Coil 25-31 Metres | 9853 | CI9 |
0.1 uF Paper 400 v.
Working |
• |
|
L15
115 16 |
R.F. Coil 31-83 Metres
R.F. Coil 75-200 Metres |
9855 | C20 |
200 uuF Mica
50 uuF Mica |
|
| L17, 18 | R.F. Coil 540-1600 Kc/s | 9749 🛧 | C22 | 2-21 uuF Air Trimmer | . 19659 |
| L19, 20 | Metres | 9747 |
C23
C24 |
2-21 uuF Air Trimmer | 19659 |
| L21, 22 | Metres | 9746 | C25 |
52 uuF Silvered Mica ±
2 uuF |
|
| L23, 24 |
Oscillator Coil 20-25
Metres |
9745 | C26 | 12-430 uuF Tuning | 18380 |
| L25, 26, | Oscillator Coil 25-31 | 9744 |
C27
C28 |
2-21 uuF Air Trimmer | . 19659 |
| L27, 28 | Oscillator Coil 31-83 | 0742 |
C29
C30 |
8 uF 525 P.V. Electrolytic
0.05 uF Paper 400 v |
|
| 1 29 30 |
Metres
Oscillator Coil 75-200 |
7/43 | Working | ||
| 121, 30 | Metres | 9742 | (3) | Working | • |
| L31, 32 | Kc/s_ | 9741A | C32 |
24 uF 600 P.V. Electrolytic
70 uuF Silvered Mica |
|
| L33, 34 |
lst I.F. Transformer
2nd I.F. Transformer |
82862
8287Z |
C34 | 70 uuF Silvered Mica | |
| L37 | Smoothing Choke 750 | 5879 | C35 | Working | • |
| L38 | Smoothing Choke | TX14 |
C36
C37 |
4 uuF Mica
50 uuF Mica |
|
| RESISTORS | C38 | 70 uuF Silvered Mica | |||
|
RI
R2 |
I megohm ½ watt
20.000 ohms I watt |
-
- |
C40 | 100 uuF Mica | |
| R3 | 32,000 ohms 1 watt |
C41
C42 |
0.02 uF Paper 600 v | • | |
| R5 | 16,000 ohms 2 watts | C43 |
Working
600 uuF Mica |
||
|
R6
R7 |
i megonim
I megohim |
C44 | 8 uF 525 P.V. Electrolytic | c | |
| R8 |
20 ohms I watt (wire
wound) |
C46 | 0.1 uF Paper 400 v | ||
| R9 | II ohms I watt (wire | C47 | 0.02 uF Paper 600 v | ||
| R10 | 0.5 megohms ½ watt | an a | C48 |
Working
50 uuF Mica |
|
|
RII
RI? |
0.5 megohim ½ waitt | C49 | 25 uF 40 P.V. Electrolyti | ic boo | |
| R13 |
1.6 megohms ½ watt
0.1 megohm ½ watt |
CEU | Working | _ | |
| R15 | 50,000 ohms ½ watt | C51 | 0.1 uF Paper 400 | v | |
| RI7 | I megohm Volume Con- | 22500 | C53 |
Working
3.000 uuF Mica |
|
| R18 | 2.5 megohms ½ watt | 20077 | C54 |
1,500 uuF Mica
2,000 uuF Mica |
|
|
R19
R20 |
l megohm ½ watt
0.5 megohm ½ watt |
C56 | 0.005 uF Paper 600 | v. | |
| R21 | 3,000 ohms ½ watt | C57 | 0.05 uF Paper 400 | v. | |
| R23 | 0.5 megohm I watt | C58 | 25 uF 40 P.V. Electrolyti | ic | |
| R25 | 0.25 megohm ½ watt | C59 |
0.1 uF Paper 400 v
Working |
v. | |
|
R26
R27 |
25,000 ohms ½ watt
0.25 megohm Tone Con- |
C60 | 0.05 uF Paper 400 | v. | |
| P28 | trol |
25360
23598 |
C61 | 500 uuF Mica | • |
| R29 | 0.25 megohm ½ watt | 11. A. A. | C62 | Working | V• 0 |
| R31 | I megohm I watt |
C63
C64 |
8 uF 525 P.V. Electrolyti |
ic
v. |
|
|
R32
R33 |
0.25 megohm ½ watt | CIE | Working | ||
|
R34
R35 |
0.1 megohm 1 watt | C65 | 0.0025 UF Paper 600 | v. | |
| R36 | 50,000 ohms I watt | C67 |
Working
0.5 uF Paper 400 |
v | |
|
R37
R38 |
0.1 megohm 1 watt ± 5% | C48 | Working | v | |
|
R39
R40 |
0.5 megohm | watt ± 5%
5.000 ohms | watt |
600 | Working | ||
|
R41
R42 |
0.1 megohm 1 watt ± 5%
0.5 megohm 1 watt ± 5% |
007 | Working | ••• | |
| R43 | 10,000 ohms ½ watt | C70 | 16 uF 525 P.V. Electrolyt | ic | |
| R45 | 200 ohms 3 watts (wire | _ . | TRANSFORMERS | ||
| R46 |
wound)
20,000 ohms I watt |
T2 |
Loudspeaker Transform
Power Transformer 40 |
ier IX4 | |
| CAPACITORS |
anna an Anna Anna.
Anna Ann |
C.P.S | 17886. | ||
| CI | 52 uuF Silvered Mica ± | LOUDSPEAKER | |||
| C2 |
2 uur
12-430 uur Tuning |
18380 | 12 in. Permanent Magne | e't AU58 | |
|
C3
C4 |
200 uuF Mica
14-33 uuF Air Trimmer |
19659 | SWITCHES | ||
| C5 | 14-33 uuF Air Trimmer | 19659 | SI |
Phono/Range Switch 8
Wafer 8 Position |
|
| C7 | 2-21 uuF Air Trimmer | 19659 | 50 | Rotary | 1900 |
|
C8
C9 |
/U uur Mica
12-430 uur Tuning |
18380 | 52 | Rotary | 2000 |
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