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Thanks for the information. The reason that I was asking is that I have been working on a replacement for the battery backed SRAMs. I currently have an 8Kx8 board design that I am testing. It does not

" If you were building a replacement for one of these delay relays (hypothetically speaking, maybe for a 533A), would it be enough to have a timer that cut a relay in after a fixed time? Is that

" For instance https://frank.pocnet.net/sheets/084/6/6NO45T.pdf . Albert" Albert; thank you; I had been thinking of this too. In industrial controls, we would use on-shot (Time Delayed) relays too,

Jeff - which are the originals and which are "new"? Renée

Have you looked here? https://w140.com/tekwiki/wiki/2712 Not OCR, but probably useful. Failing that, try Artek Manuals (http://artekmanuals.com/). They don't have it listed but they might be able to

I believe the they are DS1486, and DS1250Y (from memory of reading recently) I guess maybe I should hunt the data sheets and re-familiarize myself with the beasts - I used to know something about

Thanks for suggestions I moved the gain pot slightly but it has little effect. The power supply voltages are very close to spot on and stable but the four metal output transistors Q610, 20 30 and Q640

I have added a photo album with pictures of the two replacements I have found compared to two sizes of thumb nuts from Tek instruments: /g/TekScopes/album?id=266234 I have also found

Mark, Thank you for the effort to inform me about the secundary voltages. I expected this already. If I decide to use a 454 transformer, which is identical to a 453 transformer, I have to do some

Bruce, If you were building a replacement for one of these delay relays (hypothetically speaking, maybe for a 533A), would it be enough to have a timer that cut a relay in after a fixed time? Is that

I know folks have been talking about this for a while and it looks like someone actually did it. https://www.ebay.com/itm/303606230408?hash=item46b0576d88:g:U7kAAOSwghpe9UW- Description is a bit on

yeah, right. It is pretty warm in my lab in Calif. today -- I attempted a full normalization just now, it succeeded. Perhaps this is more proof I need to do the real work now from great posts such as

Dear all, I have received datasheets in PM's off the list and also links in this thread. Thank you all! Cheers Ulf Kylenfall

Just one more tidbit (before I decide if I'm going to dig deep into it). Enabling debug diagnostics and re-running the Frequency Normalization indicates this: “ERROR in MAIN DAC OFFSET: Cannot

The following files have been uploaded to the Files area of the [email protected] group. * /1953_Radios_Master_18th_Edition.pdf (

Ulf, I designed these into things about fifty years ago. The Amprite type numbers generally provided the data. For example a 117NO60 would indicate a 117-volt unit with normally-open contacts that

Sorry - I included a graphic of the pinout on my first reply, but I guess it was blocked. Here's the Web site that has it - along with a link to download a PDF.

For instance https://frank.pocnet.net/sheets/084/6/6NO45T.pdf . Albert

Dear forum, I have been trying to find datasheets for the Amperite time delay relays used in older Tek scopes. They are built in 9-pin tube glass envelopes. Looked in w140.com but maybe not long

1A4 is nice but needs some care, the large amount of wafer contacts need cleaning, and there's a lot of point-to-point wiring that can go bad. I even had a joint that was not soldered from the