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The idea of replacing tube rectifiers in TVs and other CRT devices is an old one. One of the most important considerations is the capacitance of the reverse biased diode. The higher the current

My brain tells me that I saw Hamegs in the rack when I visited seven years ago. My picture at https://tzi.de/~cabo/IMG_1822.JPG is not clear enough to read what’s on the scope in the rack; it

Yep. 1N400x devices are very slow to turn off; they are charge sponges that rectify as a side effect. UF4007s would be a much better choice. As to equalizing networks (R and/or C), if the individual

The following photos have been uploaded to the 7K readout exerciser ( /g/TekScopes/album?id=266548 ) album of the [email protected] group. * 7K RO tester.BMP (

It appears that the high voltage power supply runs at ~60kHz. I wouldn't trust a garden variety silicon diode like 1N400x to hack it. Fast recovery diodes might be OK but you might need to take

Absolutely! Silicon HV rectifiers beyond a kV or so are actually made of series strings of lower-voltage units. A clue is their much higher forward voltages (which makes them difficult to test with

Regular 1n4007s are too slow. UF4007s are fast enough, but it's easiest to just get proper HV rectifiers (which are actually made from strings of series diodes inside). Ed

I like the large black resistors to the right of their heads. Look like oversized fuses in their holders... In the original pic I didn't notice all the tubes on top of the shelves. What are they for?

Just wondering: Is it feasible to replace a 5642 with a string of (for example) cheap 1N4007's? I don't have a need to do this at the moment, but I already have a bunch of them. Pete

That makes perfect sense, thanks Carsten! Looking forward to the goods :-)

And are those 400 series scopes I see hints of (blue screens) on the far right of the racks? I'm back from our travels, but the book is now packed away in the shipment bound for home. I'll look up the

Schematic fixed, thanks for pointing out the error. -- Andy

Think it's a replica Manchester baby at the Manchester computer museum. See below; https://www.i-programmer.info/news/82-heritage/6016-google-celebrates-babys-65-years.html Regards - Mike

Yes. See the picture at https://tzi.de/~cabo/IMG_1834.JPG (because of the inexplicable restriction on sending attachments on this list, I just put it up in a random location. Copy that into the

Andy wrote: "The 7M13 uses a trick where it diode ORs TS2-10 together, thus requiring only 2 pins of input, TS1 to flag start of readout, and all the subsequent timeslots simply increment a

You are right about Q1-4, I was in a rush, will fix it tomorrow. I can test things with a simple current mirror, but I usually resort to a Wilson if I am not using matched parts. Just habit, perhaps a

Looks about right, except the PNPs appear upside down. If you're going with emitter ballast resistors in the mirror, then you probably don't need transistor matching or the Wilson configuration, and

Also, here is the dimensional drawing of the outline for my breakout board: https://drive.google.com/file/d/1axeTjjcMswiNkfJGYOcPmpCzqPjXmuZ-/view?usp=sharing it seems to fit well with the plug-in

Here is the schematic for the digitally controlled current sink: https://drive.google.com/file/d/1VkWHA87e2c0EbP7M8WMywmGa2pkLtviQ/view?usp=sharing That needs to be duplicated for each row/column.

I agree Harvey and Silicon Valley is close to Palo Alto/ Sunnyvale/ Mountain View area. oops back to the original thread. (I have a 575 just obtained that is going to need work the only one upon quick