6100 jacked b+

JoeB1355

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so I was messing with my franken monitor this week and my preio ppost talkeabout focus and brightness being tied together. That ended up nto being the issue. I was fixing anothe normal 6100 so I swapped some bits in and out since I had it on the bench.

seems my franken monitor works pretty well only if I jack b+ to like 240! instead of 181 for normal tube.

Basically its maxed but now my 90 degree tube is working withe decent fous now without retrace lines.

So will this fry my HV running it at max? does it make sense that I need more juice for the 90 degree tube?

I'me about ready to chop the metal box for the HV so I can fit the 90 degree tube cause its working! everything will mount ok if I zip off the corner of the box near the tube.

Thoughts on running HV at max b+?
 
Meaning that if B+ is that high you could be getting dosed with x-rays. High B+ equals high HV. Normally there is circuit that shuts down the high voltage if it gets beyond a certain level to prevent x-ray emission.

The angle of the tube has nothing to do with the B+/HV voltage. The other specs (G2, grid or heater voltage, etc.) of your donor tube are probably not the right match for the chassis.

Running it this way is bad for any number of reasons. If the transformer or something else in your HV unit is bad, and requires a B+ of 240 in order to output a normal HV of 19,500 volts, what happens if the problem is subsequently fixed (or the HV unit is put into a normal 6100) and the B+ is not turned down? It seems the HV shutdown is not working, so what if it gets worse and the HV goes even higher? Could cause harm to people in the arcade as well as damage to the monitor.

Since you have a normal 6100 available, I'd verify all the parts of both monitors using that one. Then build up your frankenmonitor and if the picture's no good you should go tube hunting.

BTW, how did you get the stock 6100/VLUP22 100 degree yoke to mate with your 90 degree tube?
 
I just slide the yoke on there. Maybe thats part of the problem. the tube is a 90 degree but it did have a cr24 connector. It fit on there fine just didn't sit as nice and close to the tube as the 100 degree one.

I tested all the parts(not the yoke of course though was gonna hose my good tube!) in a normal 6100 first. The HV was good there and adjusted fine to 181.

The picture was fuzzy with the doner tube like bad focus but if I turned the screen up would become clear but showed all the retrace lines.

So since I had just adjusted b+ I though I'd see what affect it had. and seemed to work tuning that up and the screen up. No retrace lines but clear.

And yes I'm still tube hunting as the 90 degree tube doesn't really fit in there it sits 1.5 inches out too far as it hits the HV assembly.

I was actually surprised the whole thing worked at all!

So maybe its all the yoke and I need way more juice to tighten the beams since it doesn't fit flat.

I don't have an actual HV probe I was just doing the video trick that supposed to be similiar to b+ measured on the neckboard.

All this more of an experiment and possible test monitor until I find a better donor!



Meaning that if B+ is that high you could be getting dosed with x-rays. High B+ equals high HV. Normally there is circuit that shuts down the high voltage if it gets beyond a certain level to prevent x-ray emission.

The angle of the tube has nothing to do with the B+/HV voltage. The other specs (G2, grid or heater voltage, etc.) of your donor tube are probably not the right match for the chassis.

Running it this way is bad for any number of reasons. If the transformer or something else in your HV unit is bad, and requires a B+ of 240 in order to output a normal HV of 19,500 volts, what happens if the problem is subsequently fixed (or the HV unit is put into a normal 6100) and the B+ is not turned down? It seems the HV shutdown is not working, so what if it gets worse and the HV goes even higher? Could cause harm to people in the arcade as well as damage to the monitor.

Since you have a normal 6100 available, I'd verify all the parts of both monitors using that one. Then build up your frankenmonitor and if the picture's no good you should go tube hunting.

BTW, how did you get the stock 6100/VLUP22 100 degree yoke to mate with your 90 degree tube?
 
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Dodgy yoke alignment would result in incorrect colors and misalignment between red, green, and blue.

B+ does not go through the yoke, but relates to the electron guns that light up the phosphors on the face of the screen.

What's the number of the donor tube? Even though it's a CR24 neck that doesn't mean the G1 voltage is the same. Wrong voltage there will mess with brightness/focus.

See: http://lateblt.tripod.com/bit71.txt

Going to be hard to find a 100 degree donor as I think almost every 19" tube is 90 degrees.

Be safe!
 
I'm pretty sure when I pull the yoke back and fwd on raster tubes they get way blurry when aligning them.

Yes my quest I'm sure will be a long one (been looking for more than a year already, found this CR24 so I was playing with it)! I'll keep looking though I keep a flashlight and tube chart in the car.

My current donor tube is: A48AAB11X
 
Look for older woodgrain sided Zenith TV sets with the RED LED remote control window with the little door under it on the front of the TV. Model S1989W33. 100 degree tube inside if you find one.
 
I have another donor tube this one is an A51ABU10X I believe its a 110 (20v110 stamped in the glass) degree tube and also a cr24 but does look nice and flat like the original tube so its not a 90

A51 though... so it does fit too well I think I could mod it to better fit if I decide to keep it

So I still need to crank B+, but with this tube I can get it to work almost perfectly, just a little discoloring on one side and I didn't really adjust the yoke much just stuck it on there so I'm, sure there is more to adjust there. So the higher the B+, the smaller the picture -- Is that right because that's the way it appears to be working for me. I would have guessed the opposite so is that correct? more KV smaller picture?

its works very similiar to the 90 degree tube its blurry at 181 v and nice and clear around 230

I think I need a real HV probe. What kind do folks have. I looked on ebay and saw a few but most looked like 6kv and I think that's way too small right?
 
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