Austin Radio Mfg. Co. SP Schematic

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Manufacturer:Austin Radio Mfg. Co.

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(C)John F. Rider, Publisher

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Alignmentvoltage AUS'IIN RADIO MFG. CO.
mmEL g) (a) Intermediate frequency amplifier adjustment.

The intermediate frequency amplifier has four tuning ad-
justments, accessible thru holes underneath the chassis. The
amplifier should be peaked at 175 kilocycles.

(b) Tuning condenser adjustment.

The four gang tuning condenser has four trimming con-
densers located on the top of the condenser unit. These should
be all set at maximum (clockwise) and then reversed one full
revolution. Set condenser dial at approximately 1350 K.U. and
re-adjust all trimmers for maximum response. Then set condenser
at approximately 650 K.C. and obtain maximum response by bending
the split rotor plates.


A11 plate, screen, cathode or bias voltage readings must be
made with a volt meter having a resistance of at least 1000 ohms
per volt. Readings should be taken with the volume control full
on with no signal.

R.F. amplifier plate voltage 190
Oscillator plete 60
Het. Det. plate 190
I. F. plate 190
Det. plate 110
Audio plate 250
R.F. k LF. screens 60
R.F. cathode 2.8
Occ. cathode 2.5
Het. Det. cathode 4.8
I.F. cathode 5
Det. cathode 8.2
Audio bias 18
Audio screen bias 248
MDDEL J Balancing

Set all trimmer condensers on the gang variable condenser to
maximum by turning adjusting screws to right (clockwise) and then
reverse one complete revolution; Tune some station in et approxi-
mately 1400 kilooycles on the dial and adjust all trimmers for.
maximum signal strength. Next turn dial to approximately 700 kilo
cycles. Bend the split rotor plates on the variable gang condenser
to accomplish the same condition of maximum signal strength.


All readings of direct current voltage should be made with a
high resistance voltmeter of at least 1000 ohms per volt. The
following readings should be obtained with an allowable variation
of 15%, with volume control set at maximum.

& 3.1?. plate voltage 170.
R.F. Screen ' 70.
R.F. Cathode " 2.
Det. Plate " 120.
Det. Screen " 40.
Bet. Cathode ' 4.5
Audio Plate ' 220.
Audio Bias ' 48.

@ohn F. Rider, Publisher

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