Fixed extender: https://w140.com/tekwiki/wiki/067-0589-00. Flexible extender: https://w140.com/tekwiki/wiki/067-0616-00 Raymond

Simon, I had a second look at the vertically mounted resistors and I misread the color codes (I read purple as blue), they are marked as 7.5K Ohm, just as the schematics indicate. The resistors still

Do you have a service manual for the 7A26? If not, here are PDFs of the manuals http://w140.com/tekwiki/wiki/7A26 Looking at the images of the 7A26's insides it should be easy to trace an input

Some new information... The failure code upon a ZERO operation is 2434, which the manual describes as "O/E closed loop zero high (possible defective measurement board)" The response to the GPIB

I missed out on this; didn't see it. Too Late? wrote:

I have had PayPal for many years and it has gotten a lot of use for both buying and selling. Mostly buying the last few years. Also many years ago I did a group buy for over 1000 Nixie tubes that I

Hi, Have you tried ClassicCmp? http://classiccmp.org/ Seems to be a real hive of info of the sort you're looking for. Geoff.

Where are you located? DaveD

One of my first jobs was writing CICS code that drove 3270s. Cutting edge at the time but, truthfully? I don't mind it going obscure :-) Now that I think of it, there's quite a lot of similarity

Thanks... two people who suggested Curious Marc by now...

I would suggest Curious Marc's you tube channel and the living computer museum he is a part of. They have some very early stuff including a functioning PDP1. Eric

If anyone has a friend who might have one of those, or may have worked with them, would you mind reaching out to them and asking around? I'll make sure to make it worth everyone's time. I just want to

Very odd indeed! It's all been there for a while (perhaps years), so I don't know why Roy is seemingly uniquely afflicted. --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford

Yes; I know I have. See the main page: http://w140.com/tekwiki/wiki/Main_Page "If you want to add to Tekwiki or improve existing Tekwiki pages, please email the administrator for an

How odd, I can see the 475A Service Manual (less schematics) and a collection of schematics on TekWiki, so that makes at least two of us. Are you looking at the right-hand side of the page, where I

All, Tekwiki is a website for the community of Tektronix oscilloscope enthusiasts. It started in 2008. It is edited by many people. You can browse recent changes:

Thanks everyone. Not really bothered about the dependency on a control unit for two reasons. First of all, finding /anything/ of this era will be difficult, whether it's the rarer RS232 kind, or less

Hi Jeff: I'm not sure why you are claiming this. TekWiki was down (at least here in the colony) yesterday... but I still only see a "service manual" for the 475, and not the 475A. As I posted. I

Hey again, maybe this helps: https://web.archive.org/web/20191222171302/https://stackframe.org/tekfwtool/ ? Siggi

Hey Steve, there's a thread about this on EEVBlog: https://www.eevblog.com/forum/testgear/tds-744a-(-friends)-firmware-reverse-engineering/50/. Sadly it looks like the github repository linked is no