[Station X]

Derek.

Resistors are not polarity sensitive. The position of the gold band is immaterial. It justs shows the tolerance of the resistor. The other bands indicate the resistor value. Red, Red, Red is 2.2K. Yellow, Violet, Black is 47R or 47 ohms. This replaces the original 51 ohm resistor.

MEASURING THE BIAS ON THE OUTPUT STAGE.

All components fitted except TR6 and TR7.

Meter set to a suitable DC volts range. If unsure start with the highest range and work down.

Red lead to chassis. Black lead to junction of R26 and R27.

Switch on and note reading. Should be about 0.2V or 200 millivolts (mV).


CHECKING VOLTAGES AROUND TR5

All settings as above, but connect black meter lead to each lead of TR5 in turn.

Check readings against service sheet.


MEASURING CURRENT DRAWN BY SET.

Meter set to a suitable milliamp (mA) range. Note that some meters use different sockets for current readings.

Disconnect positive battery lead from battery.

Connect red lead of meter to positive of battery.

Connect black lead of meter to positive battery lead going to set.

Switch on and note reading.



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