Ok. Let’s try this again…RCA 9TC240 Alignment

[Penthode]

Have you checked if the 6AL5 is lit?

[Chris K]

Originally Posted by Penthode

Have you checked if the 6AL5 is lit?

No not yet. I'll do that this evening

[Chris K]

6AL5 is fine. New scope in and working. Got the trace...BUT IT'S BACKWARDS!

[Penthode]

So the other scope was sick?

To ensure we are on the same page, please define backwards. Do you mean the x axis is scanning right to left? If so that suggests a polarity inversion on the x channel input.

And why is part of the trace darker? is the photo accurate to what you see or is there a shutter speed issue? If it a shutter issue, perhaps reducing slightly the scan trace speed will help.

[Chris K]

Originally Posted by Penthode

So the other scope was sick?

To ensure we are on the same page, please define backwards. Do you mean the x axis is scanning right to left? If so that suggests a polarity inversion on the x channel input.

And why is part of the trace darker? is the photo accurate to what you see or is there a shutter speed issue? If it a shutter issue, perhaps reducing slightly the scan trace speed will help.

Yes I believe the other scope was sick. This one gave me bright, clean and sharp traces.

By backwards I mean it's like a mirror image left to right like the trace rotated 180 degrees around the Y axis.

The picture being darker on one side is a shutter issue. It's a great trace, crisp, clear and of equal brightness intensity throughout.