AWA RADIOLA 495-MA Technical Information And Service Data

TECHNICAL INFORMATION
AND
SERVICE DATA
<§>RADIOLA
MODEL 495-MA
FOUR VALVE, BROADCAST, A.C. OPERATED
SUPERHETERODYNE
Issued by:
AMALGAMATED WIRELESS (AUSTRALASIA) LTD.
ELECTRICAL
Frequency Range . .
540-1600 Kc/s
(555-187.5 Meters)
Intermediate Frequency . .
455 Kc/s.
Power Supply Rating . .200-260 volts A.C.
50 C.P.S.
Power Consumption . .
35 watts
Undistorted Power Output . 1.5 watts
Loudspeaker: 4" Permanent Magnet
Transformer No. 21472A
V.C. Impedance — 15 OHMS at
400 C.P.S.
Connection to Power Supply:
The receiver should not be connected to any circuit
supplying other than 200-260 volts A.C. at a frequency of
50 C.P.S.
The connections on the power transformer are shown
below.
RED DOT INDICATES COMMON
CONNECTION FOR ALL VOLTAGES
□ □
S'
230-260 200-230
VOLTS VOLTS
SPECIFICATIONS
Valve Complement
6BE6 Converter
6AU6 I.F. Amplifier
6BV7 Detector, A.V.C. High Gain Output
6X4 Rectifier
CHASSIS REMOVAL:
The chassis together with the fret is removed by removing
the two screws at the back of the cabinet. This allows complete
accessibility to the top and bottom of the chassis and to the
pilot lamp.
Should it ever be necessary to remove the front fret, first
remove the tuning and volume control knobs. These are only
push on fits; however in the case of the tuning control,
forcing the knob past its free travel with a twisting action
is necessary to overcome friction between the knob and the
gang spindle.
Remove the dial scale.
The fret is held to the chassis by three screws, one under
the volume Control spindle and two in vertical line with
the gang spindle.
NOTE: On removing the dial scale, two other screws are
accessible through the fret. These hold the gang onto its
mounting bracket and may be loosened off for centering
the gang spindle with relation to the fret.
Reassembly is the reverse of the above. After replacing
the tuning control the pointer should be lined up on the
State Monograms on either side of the dial scale. Check the
calibration on some known stations and correct for any
tracking error by forcing the knob past its free travel In
the appropriate direction.