ctc-5 hv problem

[roundscreen]

I did that with a 6bk4 once and that set put on a good light show and my ears were ringing the rest of the night. NOW I make sure I put the tube I am checking in the set I got the replacement from.
With the focus voltage missing and the set running for a period of time may have damaged the crt. I figured the damage starts when the guns are warmed up all the way. But I am not sure on that. Also the arc may have been inside the crt. Did you notice a blue glow from the neck of the crt?? The fuse sounds like someone put in a replacement. When they put in the 2 amp it more than likely opened a week later and then they put in the 3 amp slo blow.
Try this, See if you can get your hands on a high voltage probe. Put all the tubes back in and replace the fuse with the correct one. Disconnect the crt hv lead and socket.
Then check and see if you get hv. If you do, Then hook the crt back up and see if the hv goes down and look for arcing. If it does then you know it is the crt.
Please note that I am only guessing. I would need the set in front of me to know for sure what is going on. ALSO.. Please be careful with the hv, It is nasty stuff. I won't even get into the mistakes I have made with that.
ED

[frenchy]

Originally Posted by roundscreen

Try this, See if you can get your hands on a high voltage probe. Put all the tubes back in and replace the fuse with the correct one. Disconnect the crt hv lead and socket.ED

That's what I've done today, the chassis is pulled and I am still getting no HV at the 3a3 hv terminal (grounded screwdriver) with all the tubes now in it and tested. I did not notice any popping or blue glow on the crt but then I was only looking at the screen when it happened, and didn't see anything there. Didn't see it when I had the back pulled either, all 3 guns were lit normally. It was pretty loud so I assumed it was an external pop and didn't see anything on the screen whatsoever either. Perhaps testing the crt with my crt tester would be in order. But I still have no hv period so I kind of assume the chassis problem is all I have and did not involve the crt. Would good readings on the crt test pretty much rule out damage? I forgot I do have a HV probe in the closet so I will see if I can remember how to hook it up and maybe make some measurements on the chassis. I do get a teeny tiny spark when I physically touch the screwdriver to the terminal, so there is SOME voltage on the 3a3 terminal at least, not nothing. Flyback looks great and I can't see where anything 'popped' anywhere else. Frenchy