Asteroids Deluxe Monitor Brightness

I am extremely ignorant when it comes to vectors, but want to learn. You mention a HV probe. Any threads out there that talk how to use the probe? Where do I get one?

Sounds like you might have an HV problem. Recap the cage and get a new diode, and you'll likely be all set. You'll also need an HV probe to calibrate the HV level, as if you haven't measured it, it could be way off. (Maybe try that first, as it might just be that.)

Also, the focus adjustments on these b/w's never seems to do much. I don't know what the deal is, but I've never had one make much of a difference, in all of the monitors I've owned.
 
I am extremely ignorant when it comes to vectors, but want to learn. You mention a HV probe. Any threads out there that talk how to use the probe? Where do I get one?

Search: Fluke 80K-40

80k-40.jpg
 
Search: Fluke 80K-40

80k-40.jpg

Definitely not cheap. Combined with a Fluke meter, over $500. I guess I need to learn up on what these are used for so I can justify the cost. Besides discharging a CRT, what other uses are out there to facilitate our hobby?
 
Definitely not cheap. Combined with a Fluke meter, over $500. I guess I need to learn up on what these are used for so I can justify the cost. Besides discharging a CRT, what other uses are out there to facilitate our hobby?

1. buy used on Ebay
2. don't need a "fluke" meter for it; any digital meter will do
3. make sure you get one rated well over 20kV
4. reason for having? so you don't kill yourself (or damage your games)
 
You can get an 80K-40 used for about $80 (or sometimes less, if you troll ebay long enough).

Then you just need any decent DMM with a 10 Mohm (that's Megohm) input impedance, which is what most of them have today, even the cheap ones. Pretty much any $20 DMM on ebay will do, so you're talking $100 total.

The HV probes with the build-in analog meters are ok, but that meter doesn't give you enough resolution to accurately set the HV. It might be OK for watching the HV bleed off when you discharge, but you want the digital meter when setting the HV.
 
The HV probes with the build-in analog meters are ok, but that meter doesn't give you enough resolution to accurately set the HV. It might be OK for watching the HV bleed off when you discharge, but you want the digital meter when setting the HV.

That's funny, I was just about to pop in with that exact question because that's the kind I'd bought and I was wondering how you'd use that to set the HV. :(
 
That's funny, I was just about to pop in with that exact question because that's the kind I'd bought and I was wondering how you'd use that to set the HV. :(


I don't own one of the analog ones, so I have never been sure if they allow a way for you to also hook up a digital meter. If they don't, then yeah, that might make it tricky to set the HV.

That said, It's my belief after working on many of these monitors that setting the HV exactly to the rated value isn't critical. You can be off by even thousands of volts in some cases, and the monitor will usually still work (though you don't want to be too high, and risk having the monitor start sending out x-ray radiation). However if you're off by hundreds of volts (or even a little more), it's not going to be the end of the world.
 
I don't own one of the analog ones, so I have never been sure if they allow a way for you to also hook up a digital meter. If they don't, then yeah, that might make it tricky to set the HV.

That said, It's my belief after working on many of these monitors that setting the HV exactly to the rated value isn't critical. You can be off by even thousands of volts in some cases, and the monitor will usually still work (though you don't want to be too high, and risk having the monitor start sending out x-ray radiation). However if you're off by hundreds of volts (or even a little more), it's not going to be the end of the world.

Yeah, I don't think the analog ones do have that. I wish they did; I honestly don't understand how the analog meter could be used to set HV with precision. I could probably tune it to within 500 volts but not more precisely than that; that meter's just too small.
 
I decided to disconnect my blacklight and it was a huge improvement. The light must have been washing the picture out. The pic is so much brighter. I'll have to figure out a lens to reduce the brightness of the blacklight.
 
Back
Top Bottom