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

[Penthode]

All I can say is that it looks as if you are nearly there.

You have ensured the seep is coming from the generator? And the dot you cannot move pressing each and every button? Normally when the button is pressed to select a specific marker, the dot is brighter. I don't think it has been selected from the look of your display. It may be work playing with and cleaning the push button marker switches.

[Chris K]

Originally Posted by Penthode

All I can say is that it looks as if you are nearly there.

You have ensured the seep is coming from the generator? And the dot you cannot move pressing each and every button? Normally when the button is pressed to select a specific marker, the dot is brighter. I don't think it has been selected from the look of your display. It may be work playing with and cleaning the push button marker switches.

The thing that suggests to me something is wrong in marker selection is...

When I have the sweeper producing a 3MHz sweep around 50MHz symmetrically, I have the straight line on my scope but...on the display for a marker frequency on the 8600 after say I push the center button, the marker frequency that appears on the frequency display (our favorite Nikki tubes) is not stable. It jumps around very rapidly...too rapid to see so there is no way to select a marker frequency accurately. This is what gives me suspicions it is a hardware issue.