Hi Richard, Sorry to hear that you're not well. By the way, where in the world are you please? Shipping from Sydney to Melbourne might be cheap but not from Canada. Thanks, Brian.

Hey Tom, Thanks for the brainstorming. I do need to turn the scope on it's side so I can get to the bottom panel and look under there. That, however, is a tomorrow problem. :o) I did deoxit the range

Hello all, The S-100 stuff is sold pending payment. I appreciate the interest and help! GOD Bless and Thanks, rich!

Never owned that scope, but as you say, there's very little that can go wrong. Troubleshooting should not take a lot of time unless the components are inaccessible. R925 is a 1% resistor, so I doubt

Hi all, I recently became the proud owner of this gigantic hunk of atomic history. Scope is in excellent shape and runs mostly fine but there are three problems that I have found and would like to

Hello all. I have 22 S-100 boards for sale. There are two backplanes. One is a 9 slot bare board and the other is a 19 slot fully populated board. Both boards have active termination. There are

Hi, Thanks for uploading the Service ROM. Does this go into socket U565 or U575, or somewhere else please? Regards, John

I'm not sure what I said applies to your instrument. If the SN was exactly 3 digits (1xx), what I said would apply. This was true for instruments manufactured before 1970. When I was a graduate

This sounds plausible to me. Maybe this is also the reason why each of VZOUT and VQOUT have a diode going to the +87V rail (CR966/CR972). This would presumably protect U950 from overvoltage due to

Scm the serial number on mine is b010124. That could also explain why the display unit serial number is different it is b010114

If your serial number is 124, there may be no manual for it. For several years (I don't know how early or how late), Tektronix allowed engineers to keep the development prototype instruments they were

Does any one happen to have the original service manual for a 577 D2? It seems I have one of the very early ones # 124. I went through the calibration document that is available on line but there

You might want to be careful with that. The ribbons are aluminum, and likely to dissolve if they run into anything that is too caustic. Professional cleaners often have characteristics that

A good way to clean these is to soak them in a solution of Professional Brewer's Wash. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

Run it through a dishwasher, or soak it in soapy water and scrub it with a soft brush, then let it dry if you're worried about any coating. A brand new one shouldn't be coated with anything that won't

Colin: I see the IPROM's are still on the way to you. I've started a survey of the 13 468's in the Museum's boneyard and of the first seven, found two with shorted +5 Storage Supplies, as evidenced

Sorry, 0.5nH/mm, not per inch. Too many different units clashing in my head. Sent from my iThing, so please forgive typos and brevity.

I doubt very much that there are any transmission line effects of note. Remember: The free-space delay is about 1ns per foot (and although it’s not in free space, the answer isn’t going to change

All I can say is there is nothing very transmission line like about the focus wires coming out of the base of the CRT, and traveling along in a harness until they get to the HV circuit board There

Hi Siggy, Ripple current only affects capacitor life when it becomes ripple power, and dissipates as heat. This is a pretty low duty cycle signal, I think. -Chuck Harris Siggi wrote: