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Kenwood cs-5135 low trace intensity

Hello.
Troubleshooting a kenwood cs-5135 with low trace intensity.
Anybody experience this?

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Ferenc.P
Ferenc.P picture
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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.

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