Ion Traps

[bandersen]

Perhaps there's not enough current flowing through the original trap ? Have you checked the various resistors and voltages attached to it ?

[vts1134]

The same thing occured to me last night as I was thinking about it. Seems pretty obvious now-
"What would account for the original trap not being able to get maximum brightness out of the 10BP4?"
The fact that it isn't working properly .
It seems like a lot of us are working on 630ts' at the moment. Is any one capable of giving me some reference measurements?
I've got -92V on the green side of the focus coil with the focus control set for the sharpest focus, -67V on the yellow side of my focus coil, -56v on the red side of my ion trap, and on the other side of the bleeder resistor, where the schematic shows -18V, I have -21V.



My 185A section of the bleeder resistor is off from spec. I have a different version of the bleeder resistor in my set, it is only 160ohm instead of 230ohm. That puts it off by more than 20% so perhaps my problem is that resistor.

[Geist]

HI All;
VTS1134, Have you also tried to rotate the trap once you have some picture.. Not the back and forth or front to back, that you have at the present.. But, once it shows a picture, then turn it on the neck of the tube going round and round slowly at that same position, looking for a better picture.. You may have it in the correct front to back position, but not the correct in relation to what the gun needs for full output. My clue is the cuttoff of the picture.. Now it may also, be low current in the coil, as well.. One possibility would be to disconnect one wire and wire in an Amp Meter and see what the figure actually is.. And using Ohms Law see how close it is to what it needs to be.. Check what the Schematic shows and what you actually have on your set for its values.. And compare them.. Since on the Schematic you have the Resistance and the voltage drop, you could figure the current flow.. I am not ready to power my set up as of yet.. Maybe Bob Could help, yet from His Video He is not that far along either..
THANK YOU Marty

[old_coot88]

Originally Posted by vts1134

...My 185A section of the bleeder resistor is off from spec. I have a different version of the bleeder resistor in my set, it is only 160ohm instead of 230ohm. That puts it off by more than 20% so perhaps my problem is that resistor.

Well yeah, that would also result in higher-than-called-for current thru the entire series string which includes the focus coil (you were having trouble with the focus being out of range earlier, per your PMs). Try tacking some more resistance in series with R185 to bring it up closer to the called-for value.