Mostly down. It won’t even up. I think that missing one is the main one to get it on the screen. On the other side it moves it a lot.
Back to one channel. Can you get a usable waveform/display on ch1?
If nothing else, test across the 9v battery and confirm that the trace deflects up 9v.
If nothing else, test across the 9v battery and confirm that the trace deflects up 9v.
If you ever get a second scope, you may want to repair the second channel on this one. It could be as simple as replacing the missing pot.
Why do you think you were getting the erratic signal on ch1 previously?
Why do you think you were getting the erratic signal on ch1 previously?
What are you responding to?
I asked:
Are you referring to the shaft (was a knob) in the center of the vertical amplifier control?
This has nothing to do with DC balance.
I asked:
Are you referring to the shaft (was a knob) in the center of the vertical amplifier control?
This has nothing to do with DC balance.