| Electronics > Repair |
| Current from Discharging 50Kv Color CRT |
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| nali:
I served my apprenticeship on flying-spot telecines. 36kV if I remember correctly... troubleshooting the PSUs was one of the least popular jobs for some reason which is why us apprentices ended up doing it. Never got bitten though, even though as I recall no-one had any specialised HV equipment back then :o |
| CaptDon:
Did you guys forget the one obvious discharge that was safe and recommended, The Pomona High Voltage Meter / Probe. It had the pointy tip to push under the rubber cup and had a little square meter 0 to 30KV built in to the probe. It drew maybe 1/2 of a milliamp at 25KV and was also a good way to discharge the CRT when the set was off. You could watch the voltage bleed down. And yes, it was common for some charge to build up again after the discharge on the older sets. The newer sets had focus dividers and that function discharged the CRT when the set was off. |
| coppercone2:
thick cable is harder to break if its crimped right so there is less of a chance of broken strands under the insulation even if 30AWG can handle it, I would feel better with 14 the durability as compared to wear and tear from human handling goes way down with higher gauge something as simple as trying to untangle the wire, after the 100th time, can break it and what you want is higher voltage insulation, like 3kV rated or better |
| Locator:
--- Quote from: coppercone2 on September 04, 2024, 02:44:24 am ---thick cable is harder to break if its crimped right so there is less of a chance of broken strands under the insulation even if 30AWG can handle it, I would feel better with 14 the durability as compared to wear and tear from human handling goes way down with higher gauge something as simple as trying to untangle the wire, after the 100th time, can break it and what you want is higher voltage insulation, like 3kV rated or better --- End quote --- Good points! I was going to make a couple of jumpers and was trying to find 10ga, silicone-insulated wire. I didn’t think about the insulation voltage rating. I have no idea where to find 10ga wire with 3kV insulation. Any recommendations on quality wire vendors or brands? |
| inse:
If you place the resistor at the tip, all your wire is at outer shield level, considered GND and does not need high insulation. Look at the wiring inside the TV set… |
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