Quote:
Originally Posted by DaveWM
I wonder if it has anything to do with the type of measuring equipment, I was going to try my DMM vs analog simpson next time I fire up my CTC 16, which IIRC is about 190. I wonder if the HO tube it self could drive up the current? gassy etc...
edit: that 190 was read with the DMM and 1uf bypass cap (did not have a .47 handy) and a 6JE6 tube. also using the orig filter caps (tested ok). That just seems like a big diff (190vs221). I would be real tempted to swap out the HOT just to see.
I think the HV was around 25k with a B&K HV prob, dont know how accurate they are.
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I have tried several different meters and they all read the same. As the tube ages the current goes down but it also looses the ability to supply enough hv on a bright picture.
As the horizontal drive tube/oscillator ages the cathode current goes up as the output tube looses drive.