areas for the different circuits will be found
s elector , suspect V 1 l 5 or VI80 in the Step
printed on the chassis.
Amplifier.
Heater-to- cathode leakage in certain critical
tubes will cause vertical hum , especially in the
more sensitive positions of the MA
/
DIV switch.
If this appears only in the PLAT E position of
the PLA TE-SCREEN -GRID selector the most
likely tubes are V 3 I 5 and V 3 I 6 in the Plate
Sweep Generator.
If it appears only in the
G RID position of the PLATE-SCREEN-GRID
NOTE
After
servicing
the Type 570
O s cilloscope . it is important to
check its calibration.
For this ,
refer to the Calib ration Procedure
s ection of this manual.
AA
M aintenance - Type 570
4 - 5
Summary of Contents for 570
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