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The document referred to on Tekwiki gives extensive information on the aging of tubes for use when the scopes were manufactured and for sale as replacements. That is done so that the scope will retain

Most of the criteria listed for tubes from online resellers is nonsense. The 12AX7 is a popular audio preamp tube, so anything people can imagine makes a difference like the shape of the getter or the

Jim, I will post this picture in the archives. someone else may have the same issue with their 475. -- Michael Lynch Dardanelle, AR

When a tube needs to be replaced in an oscilloscope, will matching the tube number be sufficient, or are there other items to consider about the tubes? For example, if I have a bad 12AX7, will any

Making High Voltage Transformer: https://www.youtube.com/watch?v=ZABj2UZTCXc&t=571s Ideas to rewind a HV DIY transformer Regards! Miguel -----Mensaje original----- De: [email protected]

Ok Michael, I admit it , I am as they say here a bit on the thick side. Saw the red boxes on the photo but thought they were part of the schematic. Did not realise that you had put them there. Boy are

Jim, You may have already done this, but double check your power supply voltages. I found some of the LVPS resistors on my 475A had drifted badly and my +110 rail was way over voltage. The scope

Hi Michael, Have quite a collection of tee shirts, ots of coffee stains, !!!! The board I am looking at is A9. If you sent a scan or photo, nothing came through. Just got your other email, I did

Jim, Evidently the photo I attempted to attach will not post here directly? Contact me off list at this e-mail and I can send the picture to you. If there is a way to insert pictures in a post, I

Jim, Been there, done that and have the Tee Shirt.? As chuck stated, TEK is not always the best about these locations.? Not sure how this comes about, but even the best have shortcomings.? I gave

Hi Jim, Tektronix has always been terrible about identifying these little power filter circuits. I rarely can find them on any part's layout in the manuals. The schematic where the filters are

Good morning Michael. Many thanks for the info/link. I downloaded it and it is slightly different to mine. I found the 3, 10 ohm resistors in the +15 volt supply on page 216. However none of them

Jim, Page 216 of 293 in the version of the 475 manual that I am looking at. TEKWiki has a couple of versions for that instrument. here is the link: TEKWiki is a great resource. Best of luck on

Thanks Michael, I have a few higher voltage Tants so will use a 35 or 50 volt one. Can you point me in the direction on the schematic where I can see that resistor. Will replace it as well. Again

Now THAT would be an awesome story to hear! :-D If I ever get the opportunity, you know I will be posting about it!

Jim, FYI, found this on Page 216 of 293 in the version of the 475 manual that I am looking at.? The LV supplies are populated with many of these filters.? So a good chance that others are on the

Update: 576 Transformer Inductance Resistance AWG mm Turns N AL=L/N^2 AL nH Volts Pin

Jim, I found it in the 475 manual as well. Just in a different location on the schematics. It just took a bit of searching. I have a 475A that I was able to bring back from oblivion and I was

I tied the wayback machine, this may or may not be useful. There are other web archiving crawlers.... https://web.archive.org/web/2017*/http://www.reprise.com/host/tektronix/ wrote:

You know, I recall he was asking $150 for it originally, and after about a week or so he dropped the price to $50. So a tube scavenger reached through the internet with their long straw and sucked the