...Which is what I just did. No joy. The replacement Z-axis board didn't change the symptoms. Looks like I have a spare now. Grr...

Hi David, I have wondered about this as well. But I would like to add one more personal observation to the question of phosphor color. On some occasions it has been my impression that the color of a

I have a couple things to add to this. High brightness environments can result in sharper images as seen by the eye because the pupil contracts increasing the depth of field. Some colors are better

The critical parts here are the Mostek ROMs. Four are used. It's quite possible to get pin-compatible EPROMs to use as replacements and the binary contents for all EPROMs are easily found. So, even if

That is new since I last visited Hakanh's site. He has been busy. That modification is not the same as the later combined RAM and ROM card which was used in the late 7854s. Since it uses the

I sent you a link to a 0777 CRT brand new for uber cheap over on EEV. I don't know how to PM anyone on here. I hope you scoop it up in time!!! I'm quite tempted to snatch it up myself, but I

This is a very interesting topic to me, as I worked for years to improve cockpit displays, and came across a lot of relevant info over the years. some kind of barrier was required to protect the

Right, David very informative, thanks. Raymond

I suspect almost all of the intensity dependent spreading around the spot is caused by an increase in emission area from the cathode which prevents proper focus. This is also why aged CRTs with low

Raymond, I was referring to the "Firmware upgrade and ROM reliability improvement" part of the "Tek mod kits and parts replacement" page you sent me the link to for the 7T11/A mod parts list. I

I see both the outer, constant and abruptly delimited shape, which speaks for the secondary emission, *and* intensity-dependent amplitude and spread of bleeding around the trace, which I see as the

I did reply directly to you, but your replies came back to the list. Not sure why that happened. Malcolm <TekScopes@...> wrote:

You are certainly right about the Micro Channel Plate CRT! That's a true wonder to behold.... I'd lot rather use one of them than anything with an LCD display. One of the great things about the

However the second one has damage to the plastic of the connector as well as a crack in the casing. I'd opt for the Texas probes if the Tek ones were over $50 each, but I do prefer the Tek. It also

Sorry to have caused the noise. Doing too many things at the same time (freq. compens. aof a 7A26 as well) and it's almost midnight here. I guess I should stop... Raymond

Yes, I'm pretty sure they are different. Malcolm <TekScopes@...> wrote:

Hi Dwayne, The "ideal" filter in high ambient light conditions is a circularly polarized filter. The ambient light passing through it is circularly polarized in one direction (CW or CCW, I don't

The reason I think it is secondary emission and not an optical effect is that it cuts off abruptly at the edge of the halo and the diameter of the halo does not change with intensity. The elections

After lots of data collection, historical weather checking, and polling, Saturday, APRIL 9th is the date for the next Sphere Stuff Day and Okanagan Valley-wide Radio Amateur swap meet. This gives

One has a small broken spot on the housing on one side and a sticker on the other. The other one has neither. Unless they removed the sticker (the side that's broken would be face down in the other