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Geo[_3_] Geo[_3_] is offline
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Default Tektronix 2215A worth repair?

On Tue, 8 Nov 2011 23:51:53 +0000 (UTC), Geoff
wrote:

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


I don't know this scope but used to work on another manufacturer's
models.
On one in particular, you could sometimes see this fault - it got
worse as the y shift was changed. As I recall, the problem was
timebase ripple (after flyback) on the supply to one of the tube
accelerating electrodes. The effect was more noticable as the beam was
moved (y shift) nearer to the electrode. You would need a second
scope to probe the tube pins to confirm this.