testing cathode current

[timmy]

i have a dvom and it has m.a that goes to 10 amp could i use this and put it in series somewhere? just to get an idea what the current is. problem is every pot i believe was turned and the fly was replaced so from what i understand if this cathode current is to high it could overheat the fly and burn up so after replacing resistors and tubes and a silicon dual diode and a focus coil all burned,i would rather not take a chance. would the horiz output tube be the one area to check the current by putting a meter in series with the single wire plug on top of the tube, would this be a reliable option? i am not sure at this point.

[Findm-Keepm]

Easiest way to measure the cathode current when you are unsure of things is to get yourself one of the adaptors that Pomona made. They plug in between the tube and the socket, and allow you to measure the cathode current directly, no disconnecting anything necessary. Ensure you have the service manual or Sams folder BEFORE attempting any adjustments to the Horizontal Output cathode current and efficiency coil.

I've seen the adaptors on eBay and Playthings of the Past's website - do a google/eBay search as well. Should turn up somewhere.

Cheers,