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Thanks, Stan. That's sound reasoning. I thought about it early on but having never pulled or installed a Tek IC, I was reluctant to mess around with the good 7A26. Now that I've done a few, I don't

ghpicard wrote: I think the "damage" was more likely either the eq

Dear John, I think that overriding concern was preserving MCP, which even overshadowed concern for phosphor. It appears that brightness setting is significant factor in time out. I seem to remember

Recent comments about Tek matched tubes reminded me I had some stashed away, and sure enough after a look, I have these new boxed factory Tek tubes: matched pair: 6AK5 157-0063-00 individual tubes: 2

Hi Lynn, I'll be the first to admit I don't know much about troubleshooting stuff with IC's in it but here is what I would do, if it were mine, and I had the stuff that you have. It sure sounds like

Michael wrote: I don't think that is quite correct. I can't argue with the reliability or difficulty in changing them, but I think later mainframes like the 7904A had lit plugin lights. The reason the

On this topic, does anyone know how to disable the "screen saver" feature that blanks the 2467's BrightEye CRT after about 3 seconds? (exaggerating for effect, but sometimes it almost seems that

I'm ashamed to admit I have not checked that. Will do so in the A.M. Thanks. Lynn

I was initially surprised by the 40-80Kh number also. The difference I think is that in a scope the tube is not driven as often (duty factor) or as hard (especially white background applications) as a

Gaston, The EMP is a very wild beast. One of the first tests where effects were to be measured was a test named Starfish. It fired a bomb about 200 miles above Johnson Island (do not know how far on

Jose and Richard, When you start working on those 7D01, do not forget that cheap IC sockets were used in them. Reseating ICs does wanders for these plugs. I was burned by trying to find which IC is

Hello Dave, If those gas filled tubes were high voltage indicators, as Walter thinks, they would not indicate for very long. There are no serial resistors to limit current, once 'indication' takes

Don, I like single shot mode for scope standby, too. A number of times I forgot that scope was in single shot and spent some time trying to find out 'what is wrong with my scope', but I still think

Hello Lynn, How about Trigger Source Selector (or whatever is name of that mux controlled by a rotary switch) being stuck to Channel A. I think that the selector proper are two ICs that get

parameters remember I think it's more probable that the units could reliabily withstand just one EMP, so why to risk a second EMP with a total data loss when you could buy a new one... If the unit

parameters remember I think it's more probable that the units could reliabily withstand just one EMP, so why to risk a second EMP with a total data loss when you could buy a new one... If the unit

I don't have a copy of the 7A26 schematic, so this is a *real* stab in the dark. How long are the triggering events that you're looking for? I fooled myself for a day recently while trying to fix my

I plan to get back to this after lunch today. Any suggestions would be appreciated. It's not life or death, just my idea of fun. Item: 7A26 with serial number B2.... Setup: This 7A26 is in a 7704 with

Unfortunately, the IC vertical designs don't have a thermal compensation adjustment. Again, the 7904 is an example, and my 7904s do suffer from swimming readouts.

Some of the supplies have spark gaps as well as neon lamps - an example is the 7904. I'm not sure if they are to protect the scope from the power line, or to protect the power line from the scope's HV