TECHNICAL INFORMATION AND SERVICE DATA
RADIOLA
Models 570-GA (Z) and 572-GA (Z)
FIVE VALVE, TWO BAND, A.C. OPERATED SUPERHETERODYNE ISSUED BY: AMALGAMATED WIRELESS (AUSTRALASIA) LTD
572-GA
ELECTRICAL SPECIFICATIONS
Frequency Ranges:
|
540-1600 Kc/s.
(555-187.5 Metres) 6-18 Mc/s. (50-16 Metres) |
|---|
| 455 Kc/s. |
| 200-260 volts |
| age and frequency |
| • |
Power Consumption:
| Receiver |
40 |
watts |
|---|---|---|
| Record Player |
17 |
watts |
Dial Lamps:
6.3 volts, 0.25 amp. M.E.S.
Valve Complement:
- 1. 6BE6 Converter.
- 2. 6BA6 I.F. Amplifier
- 3. 6AV6 Detector, A.F. Amplifier, A.V.C.
- 4. 6BV7 Output. 5 6X4 Rectifier.
Loudspeakers:
| Model 570-GA. | |||||
|---|---|---|---|---|---|
| 5 inch permanent magne | et No. | 20931 | |||
| . and | |||||
|
12 inch permanent magne
Transformer No. 31772H |
et No. | 20929 | |||
| V.C. Impedance – 3 ohms | at 400 | C.P.S. | |||
| Model 572-GA. | |||||
|
5 inch permanent magne
and |
et No. | 20931 | |||
|
12 inch permanent magne
Transformer No. 31772H |
et No. | 20930 | |||
| V.C. Impedance – 3 ohms | at 400 | C.P.S. | |||
| וכ |
IE:
On later models of 5
12 inch permanent may No. 21000 and No. 2100 |
70-GA (
gnet sp |
Z) and
beakers |
572-GA
are chan |
(Z) the
iged to |
e changed to 21009 and ctively. The transformer used is No. 20996A and the V.C. Impedance is 6 ohms in both cases.
Undistorted Power Output ..................................
Chassis Removal:
- ) Remove the cabinet back.
- 2) Disconnect the Loudspeaker, Pick-up and Phono-motor cables
- (3) Remove two bolts holding the chassis to the wood blocks supporting it.
- (4) The chassis is now free to lift out.
CIRCUIT CODE-RADIOLAS 570-GA, 572-GA
| Location | 5 5 | 25 | FIO | S | 5 | D4 | B7 | B7 | D8 | D7 | B10 | B10 | - 8 | 5 6 | ÷ | E14 | F13 | E14 | ő | Loudspeaker | FIO | B15 | G | F14 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Part No. | 10225 | 10000 | 18674 | 18674 | 31772H | 25807F | 22809F | 20931 | 20929 | |||||||||||||||||||||||
| Description | 440 μμF padder ± 2½% | 4-2/ μμг плитег | 1,000 µµF silvered mica | 12-445 μμF tuning | 12-445 μμF tuning | 47 μμF silvered mica | 100 µµF silvered mica (in 1st 1.F.) | 100 µµF silvered mica (in 1st 1.F.) | 0.05 µF paper 200V working | 0.05 µF paper 400V working | 100 µµF silvered mica (in 2nd 1.F.) | 100 µµF silvered mica (in 2nd I.F.) | 220 µµr ceramic | 0.1 "E samer 400V working | 100 mile silvered mice | 0.07 MF sivered mice | 24 µF 350 P.V. electrolytic | 0.005 µF paper 600V working | 0.05 µF paper 400V working | 24 μF 350 P.V. electrolytic | 2 µF paper 200V working | TRANSFORMERS. | Loudspeaker transformer | Power transformer 50-60 C.P.S. | 40 C.P.S. | SWITCHES. | Phono/Radio Switch | Power Switch (on R18) | LOUDSPEAKERS | 5 inch permanent magnet | 12 inch permanent magnet (570-GA) | |
| Code No. | ő |
2
C C |
CII | C12 | C13 | C14 | C15 | C16 | CI7 | C18 | C19 | 620 | 25 | 15 | 35 | 225 | C26 | C27 | C28 | C29 | C30 | F | 12 | SI | S2 | ISI |
LS2
LS3 |
|||||
| _ | ||||||||||||||||||||||||||||||||
| Location | ٤ |
2 2
2 |
E5 | £ | £ | B7 | B10 | D.5 | 25 | D2 | E10 | E10 | 8 | 6 | DIO | 4 0 | E12 | F12 | E10 | D12 | G14 | - | 2 | 36 |
2
2 2 |
F6 | E4 |
63
07 |
||||
| Part No. | 6960 | 30710 | 30768 | 28229 | 32406 | 27351 | 27353 | • | 1/00000 | 1/40026 | 32809/1 | • | 19659 | 1001 | 16347 | |||||||||||||||||
| Description | Let. Filter (incloaing CI) | Aerial Coil 540-1600 Kc/s | Oscillator Coil 6-18 Mc/s | Oscillator Coil 540-1600 Kc/s | 1st I.F. Transformer | 2nd I.F. Transformer | RESISTORS | 0.1 meaohm 1 , watt | 100 ohms + | 22,000 ohms ½ " | 0.47 megohm 1 / 2 " | 0.39 megohm ½ " | 11,000 ohms 2 " | 330 ohms 1 / 2 ,, | 2.2 megohms ½ " | 4/,UUU ohms ½ ,/ | 10 mecohme 1 | 0.22 megohm 3 | 3,400 ohms 2 " | 1,000 ohms ½ " | 4,700 ohms ½ ,, |
0.1 megohm tone control (incl. S2)
100 ohms 1 watt |
CAFACILORS | 2-20 uuF air trimmer | 9 uuF silvered mica | 4,000 μμF padder ± 2½% | 6.8 μμF ceramic | 1-12 μμF trimmer2-20 μμF air trimmer | ||||
| °. | 2 | ~ | 10 | 12 |
Drive Cord Poplacements
The accompanying diagram shows the route of the cord The accompanying diagram
Manufacturer's Setting of Adjustments
The receiver is tested by the manufacturer with precision instruments and all adjusting screws are sealed. Re-alignment should be necessary only when components in tuned circuits are repaired or replaced or when it is found that the seals over the adjusting screws have been broken.
It is especially important that the adjustments should not be altered unless in association with the correct testing instruments listed below
Under no circumstances should the plates of the ganged tuning capacitor be bent, as the unit is accurately aligned during capacitor be beni, as the unit is accurately aligned skilled operators using special equipment
For all alignment operations connect the "low" side of the signal generator to the receiver chassis and keep the generator signal generator to the receiver chassis and keep the generator the volume control in the maximum clockwise position
Connection to Power Supply
The receiver should not be connected to any circuit supplying other than alternating current from 200-260 volts and at ing other than alternating current from 200-260 volts
The power supply connections are shown in the accompanying diagram
Testing Instruments.
(1) A.W.A. Junior Signal Generator type 287003 or
(2) A W A Modulated Oscillator series J6726. If the modulated oscillator is used connect a 0.25 megohm non-inductive resistor across the output terminals, and for short wave alignment, an additional 400 ohms noninductive resistor in series with the "high" output lead of the instrument.
(3) A.W.A. Output Meter, type 2M8832.
NOTE: On the short wave band the oscillator is working on the low side of the signal frequency; therefore, the image will now be heard if the receiver is tuned to a higher frequency than the signal. For example, if the receiver is tuned to receive a 16 Mc/s signal, the image will be heard at 16.9 Mc/s instead of the usual 15.09 Mc/s
| Order |
Connect "High" side
of Generator to: |
Tune Generator
to: |
Tune Receiver
Dial to: |
Adjust for Maximum
Peak Output: |
|---|---|---|---|---|
| 1 |
Aerial Section of Gang
(Drive End) |
455 Kc/s. | 540 Kc/s. (4QL) | L12 Core |
| 2 |
Aerial Section of Gang
(Drive End) |
455 Kc/s. | 540 Kc/s. (4QL) | L11 Core |
| 3 |
Aerial Section of Gang
(Drive End) |
455 Kc/s. | 540 Kc/s. (4QL) | L10 Core |
| 4 |
Aerial Section of Gang
(Drive End) |
455 Kc/s. | 540 Kc/s. (4QL) | L9 Core |
| Repeat the | above adjustments until the | e maximum output is obtai | ned. | |
|
5
6 7 |
Aerial Lead
Aerial Lead Aerial Lead |
600 Kc/s.
1500 Kc/s. 1500 Kc/s. |
600 Kc/s. (7ZL)
1500 Kc/s. (3AK) 1500 Kc/s. (3AK) |
L.F. Osc. Core Adj. (L8)*
H.F. Osc. Adj. (C9) H.F. Aer. Adj. (C6) |
| Repeat adjustm | nents 5, 6 and 7. | |||
|
8
9 |
Aerial Lead
Aerial Lead |
16 Mc/s.
16 Mc/s. |
16 Mc/s.
16 Mc/s. |
H.F. Osc Adj. (C7)†
H.F. Aer. Adj. (C2) |
ALIGNMENT TABLE
* Rock the tuning control back and forth through the signal.
t Use maximum capacity peak if two can be obtained. Check to determine that the trimmer has been adjusted to correct peak by tuning the receiver to approximatly 16.91 Mc/s, where a weaker signal should be obtained.
Alianment Procedure
D.C. RESISTANCE OF WINDINGS
| Winding |
D.C. Resistance
in Ohms |
|---|---|
| Aerial Coil (M.W.) | |
| Primary (L4) | 13 |
| Secondary (L5) | 1.5 |
| Aerial Coil (S.W.) | |
| Primary (L2) | 2.5 |
| Secondary (L3) | * |
| Oscillator Coil (M.W.) (L8) | 3.5 |
| Oscillator Coil (S.W.) | and the second second |
| Primary (L6) | * |
| Secondary (L7) | * |
| I.F. Filter (L1) | 17.5† |
| I.F. Transformer Windings | 17 |
| Power Transformer (T2) | |
| Primary | 50 |
| Secondary | 350 |
| Loudspeaker Input Transformer (T1) | |
| Primary | 350 |
| Secondary | * |
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 1 ohm.
† In some receivers this reading may be as high as 60 ohms.
SOCKET VOLTAGES
| VALVES |
Cathode to Chassis
Volts: |
Screen Grid to
Chassis Volts: |
Anode to
Chassis Volts: |
Anode
Current mA: |
Heater Volts: | |
|---|---|---|---|---|---|---|
| 6BE6 | Converter | 90 | 185 | 2 | 6.3 | |
| 6BA6 | I.F. Amp | - 2 | 90 | 185 | 4.5 | 6.3 |
| 6AV6 | Det., A.F. Amp., A.V.C | 130 | 1 1 | 6.3 | ||
| 6BV7 | Output | ^ | 185 | 245 | 24 | 6.3 |
| 6X4 | Rectifier | 250 | 235/235 | 6.3 |
Total H.T. Current = 45 mA. Back Bias across R6 = 4.5V.
Measured at 240 volts A.C. supply. No signal input. Volume Control maximum clockwise.
Voltmeter 1,000 ohms per volt; measurements taken on highest scale giving accurate readable deflection.
MECHANICAL REPLACEMENT PARTS
| ITEM | Part No. | Code No. |
|---|---|---|
| Chassis Assembly: | ||
| Bracket Assembly (Retaining Phono/Radio Switch) | 33993 | |
| Bracket Pulley Assembly | 33994 | |
| Bracket Tuning Spindle | 33387 | |
| Clamp (Retaining Power Cable) | 1221 | |
| Clip (Retaining I.F's) | 27780 | |
| Clip (Retaining Phono-motor socket) | 21915 | |
| "C" Clip (Retaining Pulley No. 7885) | 2537 | |
| "C" Clip (Retaining Pulley No. 17716) | 4885 | |
| Cover (Power Transformer) | 20150 | |
| Dial Scale | 32230A | |
| Drive Cord Assembly | 32812/1 | |
| Drive Drum Assembly | 34123 | |
| Grommet (Power and Loudspeaker Cables) | 389005 | |
| Knob, moulded (1) (Tone Control) | 34137 | |
| (nob, moulded (2) (Volume and Tuning Controls) | 34138 | |
| (nob, moulded (1) (Phono/Radio Switch) | 34299 | |
| amp Holder | • 4194 | |
| oudspeaker Cable Assembly | 33564 | |
| Nasonite Cover | 33991 | |
| Jut (Retaining Volume Control) | 5926 | |
| Pilot Lamp Cable Assembly | 33565 | |
| in Lack Assembly (Test outlet) | 07495 | |
| 27000 | ||
| 339/9 | ||
| 20743 | ||
| 7885 | ||
| 1//16 | ||
| 33365 | ||
| 33978 | ||
| Pulley Post (small) | 20202 | |
| crew (Retaining Masonite Cover) | 760369 | |
| Screw (Broadcast Coil Mounting) | 31373 | |
| socket Valve / pin | 794576 | |
| socket Valve 9 pin | 793037 | |
| Socket Assembly (Phono Motor) | 28313 | |
| socket 2 pm (Pick-Up) | 793038 | |
| spacer (luning Gang) | 33398 | |
| spacer (Dial Scale) | 430 | |
| spring, drive cord | 1741 | ٠ |
| erminal Panel Assembly, 2 way | 32822 | |
| lerminal Panel Assembly, 3 way (2) | 32824 | |
| erminal Panel Assembly, 4 way | 32834 | |
| erminal Panel Assembly, / way | 32835 | |
| folume Control Cable Assembly | 33567 | |
| Miscellaneous | ||
| 00101 | ||
| 20121 | ||
| 28122 | ||
| addition back Assembly (570-6A) | 34200 | 010040 |
| 212049 | ||
| 01000 | 212001 | |
| 31909 | ||
| 31908 | ||
| last Reflectore Spacere | 34230 | |
| ndicator Assembly (572-GA) | 34231 | |
| (nah door tung 631 (572-GA) | 34252 | 10000 1 |
| ever Assembly (Peceiver Compartment door) Promo | 0017/ | 423024 |
| ever Assembly (Receiver Compartment door) pronze | 331/6 | |
| id Support Assembly (Pight hand) (Pagerd starse days) C | 331/4 | |
| id Support Assembly (Right-hand) (Record storage door) Chrome | 33971 | |
| au support Assembly (Lett-nand) (Record storage door) 'Chrome | 33972 | |
| id Support Assembly (Kight-hand) (Kecord storage door) Bronze | 34139 | |
| u support Assembly (Lett-hand) (Record storage door) Bronze | 34140 | |
| 27614 | ||
| rower Cable Assembly (Phono Motor) | 32469 | |
| F.U. Caple Assembly | 32470 |
When ordering, always quote the above part numbers or code numbers, and in the case of coloured parts such as cabinets, knobs, etc., the colour plus the part number.
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