Geoff wrote in message
...
I have a tek 2215A CRO with following fault..
Left side of trace has a ripple, about 1/2 division vert
amplitude and about 25% of horizontal is affected.
Both channels the same
When vert offset is manually swept, the pattern of ripple
changes, still both channels the same
Timebase does not change shape or size of ripple
ripple is 1/2 or 1 cycle but is like someone has put a magnet on
the side of the tube.
Changing attenuator makes no difference.
Was OK a few months ago when last used

If this is a tube fault, I will junk it, what do others think?


I would suspect something in the flyback suppression/blanking area