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I bought this R7903 at a local hamfest for $10. I'm going to try to see if I can fix it, mostly for the learning experience. I have had some minor experience working on electronics, but not on scopes.

The triangle was supposed to be a sine wave. I figure out what the problem is. It was the trigger! I posted new pictures. The traces are now thin and solid. The vertical is a little off, so I guess

Some things you ask about are easier than others. * The 7CT1N has no readout capability (hence the N suffix). It wouldn't be practical (or even possible) to add it unless you had the ability to make

To download trace information from a scope you need some way of digitizing the signal. That is why downloading of traces are usually only supported by digital scopes and not analog scopes. --Victor

As a guess anyone recognizing my name/posts would know I am making a hobby out of refurbishing/rebuilding a few 7000 series scopes and plug-ins. As I have been doing so I have become more and more

468 can't have a DM44, but the cover should fit just fine. -ls- Kevin Berlen <kberlen@...> wrote:

Oops, I realized that a couple of minutes after posting. You would have to use a negative resistor :)

I need to know if a cover for a 468 will fit on a 465B. both scopes appear to have the DM44 option. Thanks, Kevin

I don't think you can get there that way. The coding ring resistors add orders of magnitude of attenuation. He wants to move it the other direction. -ls- David DiGiacomo <daviddigiacomo@...>

<branadic@...> wrote: I think the readout scale factors only go up to 100X, but you can connect a pot or decade box from the probe coding ring to ground, and see for yourself.

It was scanned by Al Kossow, but I have it available also: http://www.slack.com/concepts.html

Nice walk down memory lane, Michael

Enjoy. http://w140.com/tek_new_products_march_1972.pdf -Kurt

I'm trying to get a very early 453 (IBM) working. It came with no mains lead,(3-pin round socket) and one of the input Nuvistors (8393) seems to be dead. If anyone happens to have either item in their

I have had sometime to check out the LD110ACJ and LD111ACJ as well as the LD121ACJ I did not check out every chip as there was no reason to. ?All the chips were the correct part and worked in every

YES! ? Unfortunately, the pictures aren't there, and I can't seem to be able to find Part Two on how to modify the 576 for the job. ? Thank's a lot, ? Jim

Jim, Let me know if this works.... http://dl.dropbox.com/u/27593700/Testing_Vacuum_Tubes_with_a_Tek576.pdf glydeck@...

It seems that at least the first two pictures use the same sweep knob setting, 5 us/div. Also all 4 pictures seem to show the same distortion, a square wave like distortion, synchronous to the

Actually, I found that photo on a forum. ? I'll try to find it again and contact the guy. ? I couldn't figure it out either, unless he rewired the CRT!

Is there noone with an idea of how vertical scale indicator can be superposed by an external scale indicator? branadic