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Personally I have a 2465a that has some blown caps (repairs in process) and a 2225. I gave away my drawers of tubes back a couple decades ago.... I do appreciate the design of the old 500 series

Hi Wolfgang, Neat instrument just to see what the setting and specification ranges might be like. Would you be OK having this and your images on Tekwiki? Will be interesting to find a manual or

Oh, ok. While I have some things that are collectable (and I may never get to work), if I have it, I'd like to use it, since I actively do electronics design. I will confess that I am saving the

“Personally I'd replace C911: 22uF 15V tant bead on a 13V PSU rail, diagram 17 (not the PSU diagram!)” Interesting..... It’s been a while, but I think this is the first failure of my 485! Did

Stan donated the rights to reproduce his book to the vintageTEK museum. We sell a CD copy of it on on the museum eBay store. Stan is not reproducing his book that we are aware of. The museum is in the

Hi Phil, Thanks for pointing that out. I saw that web page and the fact that it was a Barnes and Noble site and it said hard copy and I assumed it was a new printing. All of the original printing of

Thanks to everyone showing interest in this topic. My pictures are at: https://photos.app.goo.gl/vWHUhwHc74o7ed7Q9 Thanks for looking. John

Watching this little thread with interest and a little surprise seeing all these scopes still in use. I’ll add my collection to the list: 561A x2, one for parts RM561A I generally use, mounted in a

Hi John, I've recently joined and have been lurking wondering the same thing. I'm part way through restoring a 535A, a 547 and have recently completed a 503. It is definitely a labor of love on

Hi John, I still have a 564 storage scope on the bench, it's smaller then a 547, etc and there's lots of plug-ins including sampling units! I guess I cornered the market on mint 3L10 SA units too.

I had to keep looking and Q1478 is also shorted. Did the shorted tantalum take out both Q1474 and Q1478? Man, that happened since I started working on it. I had to order Q1478 so, I'm done for a

The .01uF 6kV disk capacitor arrived yesterday and this evening I soldered it in between T1320 and the NTE539 voltage tripler. I powered up the scope and Bingo! There is a trace bright and

OK, I have made progress. I found a bad 18 ohm resistor near Q1496. It wasn't open but measured in the kilo-ohms. One of my component checkers thought it was a cap due to the varying resistance. I

This is a used book...? Just sayin' Phil

Dang, held on to my copy too long !! Richard S. wrote:

If anyone is interested, I live 4 blocks from Vetco and I know the owner very well so it may be possible to get these scopes at a great price. I can pick them up and get the packed for shipment for

Hi John, The 7904A and the 7934 are both outstanding scopes for different reasons. The 7934 is quite rare because it was introduced 3 years before Tek ended the 7K product line. SO it is highly

Hi John, Stan Griffiths of Aloha OR is THE definitive collector of Tek tube scopes. By now he has upwards of 1,000 in his ham shack, storage containers, and other out buildings on his property. Stan

Glen, The ripple looks ok. The manual I am using is the 108MB file on the 475 page at w140.com/tekwiki. If you locate schematic <12> power supply, the previous schematic shows power distribution

Hi John, The resistor string is pretty evident. It is about 10, 10M SMD resistor all in series, sitting off by themselves. You can see it when you pull the cover off the HV. Clear plastic cover