Fw: Re: Coby CX1 TV Modification for (*e-) Electronium Search
To: [EMAIL PROTECTED] Date: 3/7/2006 8:37:24 AM Fred - I had a little time between the cleaning chores to unsolder just the little red deflection lead from the card on the side of the tube. Eureka - now getting a beautiful horizontal line across center screen. I had to turn the brightness control all the way down to keep the intensity at a safe level for the phosphor. The line is really sharp and crisp! Much better than on a scope! The next chore will be to do some diagnostics on the vertical deflection coils - get their resistance, try to see if my DMM will measure the drive voltage across the circuit, etc. Then, I can come up with a small battery supply to put a variable DC across the vertical deflection coils. May be a while before I get to do this...
Fw: Re: Coby CX1 TV Modification for (*e-) Electronium Search
Roll the dice? To: [EMAIL PROTECTED] 3/7/2006 2:05:14 PM Fred, it looks like the vertical coils have, 3.5 ohms DC resistance. I drove them with 1.42 volts DC which put the trace just off the top edge of the screen. Using the red lead post as positive gave the upward deflection. Using ohms law, I figure with a 5 watt, 27.3 ohm resistor in series with the coils 3.5 ohms, I can just hook it across my 12.5 volt car battery for a long run. Tonight when it gets dark I'll give it a try and see what I can see. (Yes, I'll get my eyes dark adjusted first.) I'll try to pick a deflection that gives the least backglow so it will do minimum damage to our resolution. If you have the means you could do this: 1. Snip the two vertical drive wires (red and white) about in the middle so you can resolder them later. 2. If you have a battery box for a single 1.5 volt cell (bigger cell the better since it pulls almost 1/2 amp) you could just use a cell to get the trace just off the top of the screen. Make the red lead positive as above. Be sure to back the brightness all the way down first! Using the car battery I can drive the necessary 0.4 or so amp for a long test time. I have the power supply driving the TV set so I think this is the best way to do it.
FW: Re: Coby CX1 TV Modification for (*e-) Electronium Search
So much for Phase 1 Suggestion box? To: [EMAIL PROTECTED] Date: 3/7/2006 6:33:48 PM Subject: Re: A little more progress Well, if the ~ 3-electron-mass particles exist, Fred, I'm seeing no sign of them in our experiment. The experimental rig we designed is working just according to plan. The modified vertical deflection gives a neat horizontal line which can be deflected near the upper edge of the screen by driving it with about 1.35 to 1.4+ VDC. With the brightness turned all the way down, the trace is just about right. I was working with the trace about 3/8 inch from the top of the screen - I had covered it (as you suggested) with a strip of electrician's tape. This masked the electron trace very well, but - as I feared - the backlight from the trace lighting the rear sides of the tube gave a very faint background glow to the screen. You need not dark adapt your eyes for long before you realize that this unwanted glow will tend to limit the sensitivity. Still, I'll guess that I could have picked up a rogue trace even one thousandth the brightness of the main electron trace. No such trace could be detected (by me) after several minutes of screen watching. If I tried to boost the trace brightness, the result was just to increase the background light and it seems that this is a losing variation. As I mentioned earlier, You could probably duplicate this setup by doing no more than snipping the vertical leads and substituting a single 1.5 volt battery for the vertical drive. Come to think about it - a lower voltage nicad cell might be even better and would require no additional series resistance.
