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factory · 16th Jul 2021, 9:46 pm

Well things have gone backwards, last thing I did was clean the beam finder switch contacts on Sunday, I didn't have enough time to try it then.

Tried it tonight and I now have no trace at all, not even when the beam finder is pressed and the scale illumination has gone too.
Need to check I still have voltage going to the two CRT heaters tomorrow (fed from the mains transformer), but I'm worried the CRT is dead.

David

16th Jul 2021, 9:46 pm	#45
factory Octode Join Date: Jul 2009 Location: Cheshire, UK. Posts: 1,739	Re: HP 180A Oscilloscope. Well things have gone backwards, last thing I did was clean the beam finder switch contacts on Sunday, I didn't have enough time to try it then. Tried it tonight and I now have no trace at all, not even when the beam finder is pressed and the scale illumination has gone too. Need to check I still have voltage going to the two CRT heaters tomorrow (fed from the mains transformer), but I'm worried the CRT is dead. David