Elmo 16-CL - Page 73

♦ Measure the voltage at each checking point by Vacuum-tube Voltmeter.
Values surrounded by r i are specified voltages measured under following steps.
1. Turn Volume Control Knob fully clockwise.
2. Set Tone Control Knob at the center position.
3. Apply 4.8mV-400Hz signal oscillated by Oscillator to Mic. receptacle (Fig.33»J2)
4. Set Volume Control Knob so that the output level measured by Vacuum-tube
Voltmeter may be ll*3dB lower than its maximum level.
If use a Tester instead of Vacuum-tube Voltmeter, be sure to use one whose internal
impedance is more than 1 Kohms/volt at AC.
♦ Other voltages mentioned in this circuit diagram are DC voltages when no signal is
applied. If use a Tester, be sure to use one whose internal impedance is more -than
10 Kohms/volt at DC.
♦ If the internal impedance is less than the above-mentioned value, proper value would
not be measured.
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2, .»v
I £ § 2SC10W
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* EC I
51^120
1C I LD3H5
4.8 mv C400 h O
Fig. 33 Amplifier circuit plate for 16-CL
E20454