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Looks like my tired brain typed in a cross of two part numbers - crossed rows in the E Parts List. Not as bad as crossing streams, but yeah, there ya go. SUE - stupid user error. I have some 10k pots

Sorry about that the DS1230 is a direct replacement for the DS1235 according to https://www.maximintegrated.com/en/design/technical-documents/app-notes/2/202.html#q13 So you should be able to use

I replaced the NAVRAM modules in my 2440 and the scope stopped working.? I reviewed my work and it looked okay.? I used Chinese chips that perhaps were counterfeit.? I put one of the old chips back

And TekWiki. DaveD

Why not both sites, it give a measure of backup...

Back before I shut down my company, I hosted a set of web pages covering things I had learned about the Tekmate add-on processor. The 2402 added some capabilities to the 2400 series of DSOs including

I was wondering what such a TV would look like, and what do you know, YouTube has a good answer. https://www.youtube.com/watch?v=I4c2XTnl3Ao

First let me say that anything I've received from Walter has been fantastic. However, I'm not so happy with the Canadian postal service. A couple months ago I got some "free" Tek manuals from a member

Quite a while ago i wrote a script that would generate edge connector footprints for gEda mostly because anytime I have to do something more than 3 times I automate it. You could generate an entire

I recently received a pair of HP power supplies from Walter. The shipping, even on these heavy items, was reasonable and less that most E-Bay sellers charge from the USA. There were not any customs

When the COVID restrictions ease, I hope you open a 2nd shop in America. Shipping and customs make it so I don't even bother to look at you site any longer. This is a suggestion and not a complaint

Apologies I meant faster than 200ns. Not 100. The original battery backed chips in my unit were 150. 200 works fine.

Heres the memory replacement I used: https://www.digikey.com/en/products/filter/memory/774?s=N4IgTCBcDaICIGUCMYwAYCCAhEBdAvkA Specifically DS1220AB-200+ but I linked to the search because stock

I’ve done that repair several times. The Dallas chips were available from Digi-Key but I hear some had replaced them with modern SRAM. I opted to use the original DS1220’s from digikey in my

Agreed- I also thought of the VCR97 when I saw that base - in fact I'm going to follow this up and if I can, confirm or otherwise as regards the CRTs used in the first and following several

The naked CRT in the foreground looks very much like a VCR97 to me. That was the CRT developed for WWII airborne radar and navigation applications and it was available at low cost in large quantities

Hi All - I've reviewed the posts here regarding the repair of a Tek 2440 due to dead batteries in the Dallas Semi NVSRAMs. Notwithstanding the great information in those posts, as well as in Hugo

Aren't the CRTs in the 5000-series ceramic neck with a plate glass face? The CRT may well have been replaced after something unfortunate happened to the original one. I'm really jealous about the blue

What the heck! I looked there! Well you have the touch Jeff. eBay likes you better? I'm curious why the scope has the serial number and option windows on the back plate, and the option window isn't

Dave, I see the exact part (Tek P# 311-1120-00, CTS P# 201-YA5531) on eBay for eight bucks (plus $3.68 shipping) which seems a bit steep, but you get two pieces for that price (still a bit steep,