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I finally repaired it by putting 22 volts into the TL494 circuit. It turned out C917 was leaking significant amounts of current. Took me a while because I didn't expect ceramic capacitors to fail

Yea it very much looked like that one, it could be that one but if my memory serves it was more on a larger one piece table. The second year he brought it it was bigger and more complicated and he had

Yes a self Cal and external Cal will restore the scope to working condition. You will need calibrated source equipment to calibrate the 2430A if you want a calibrated scope. For home use you may get

Hi Chris I have a similar problem on a 2465 DMS. Which I have not yet been able to solve. The +87V supply is required to function enable the +42 Volt supply. The +42 Volt supply drives the

Or this? Meccano Differential Analyzer (youtube.com) <https://www.youtube.com/watch?v=YDBU36LbC2o>

Maybe one of these? The Meccano set computers: a history of differential analyzers made from children's toys (ed-thelen.org) <https://ed-thelen.org/comp-hist/Meccano-01.pdf>

A number of years ago at the first Maker Fair in the SF Bay Area, San Mateo, a gentleman brought a totally mechanical DA (a Babbage machine) style made with "Mechano" parts it was huge about 10' by

I have a 2430A that is just starting to occasionally fail the FPP battery test at power on. It is a later serial number that does not have the large lithium battery, but has the two Dallas NVRAM

Gianni did provide the PDF for free. That must be what you're thinking of. I would rather have a paper copy - great coffee table book for scope geeks.

Hi Steve, Those both slipped in under my radar. Thanks for the links. I've never seen an EAI 180 before. Interesting machine! Too bad they're both too far away. I'm open to shipping things, but I

Hmmmm...? Wikipedia doesn't answer the big question (at least for me): Why was it called the Millionaire?? ?Fascinating history nonetheless.? ?Thanks for posting the links.? ? ? ? ?

All those new-fangled things are for the weak-kneed !! Back in my day we used the "Millionaire

I remember the (Smith-Corona) Marchant mechanical calculator, about the size of a typewriter (remember those?) that my dad had in the chemistry lab back in the 1970s. He also had a Monroe electronic

Ok, if the output of the character generator at the x and y inputs to the deflection boards is ok, and you see no distortion, then the source of the distortion is likely either a mismatch between the

I finally go around to trying the XY display. It works quite well. As for the stretching characters, I don't see any of that; however, I'm waiting to get the replacement IC for the vertical board to

Thanks Mark, I hope my story helps others. It would be a shame to junk a nice 'scope for the sake of a 10c resistor. Peter wrote:

Peter, Glad to hear you fixed it. I had wondered about that resistor. Knowing it has 140V across it, I will note that in case mine gives the same trouble then change to a 1/2W. Mark

My last message did not display well using copy and paste but the information is there. To summarize and answer my own questions. The problem appears to have been an intermittent R1031 which was

Christian, Any chance that you could post some pictures of sliding out the drawer? I’m also curious to hear what your gray encoder solution is. Currently suffering with that issue on my 370.

Does anyone have experience with calibrating the CTT? What did you use for a pulse generator? *Check the U1030 circuits* · Circuit operation: An output voltage is fed through high