Hi! There are several possible causes for this error. - Does it have some effect if turning the BRIGHT knob? - Is there any change in the V/div sensitivity (presence of +12kV)?
In most case, the biasing circuit of the tube may be responsible.
Feri.
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Hi!
There are several possible causes for this error.
- Does it have some effect if turning the BRIGHT knob?
- Is there any change in the V/div sensitivity (presence of +12kV)?
In most case, the biasing circuit of the tube may be responsible.
Feri.