Hello Jean-Paul, May I do you an offer to try to repair your power supply? Please PM me. Jaap PA0JRK Netherlands

Bonjour a tous: Working on 7L5 with L3 input module and OPT 25 tracking generator. FREQ knob has several defective positions, 1k 2k 5kHz : These intermittently fault to 100k, 200k and 500k

To the many people who have contacted me expressing interest in a copy of Peter's book: Out of concern for his privacy I have contacted him via email to see how he wants to handle this. As soon as I

Christian, these special materials were needed ONLY for high-Z, wide band, low leakage applications, like the 1megohm front end of a scope. There are lots of options for low-Z environments. Ed

Regarding the special attenuator substrate: I don't believe that polyethersulfone sees very much use these days. I do a certain amount of microwave PCB design and I can't say that I've ever even

Yes indeed, Raymond - hook was the main thing, and quite obvious. I don't recall if it was due to a non-linear capacitance effect, or a form of dielectric absorption. Ed

Don't go via the directory listing please - this is (only part of ...) the internal folder structure of the Wiki. All the files are listed in the Wiki (e.g.

ISTR that a few years ago, David Hess explained in this group that one reason to use the material in this kind of product was to avoid an effect called "hook". Raymond

I should mention that for lower cost, Tek used an alternative material for the 2200 series attenuator board assemblies. As I recall, it's a special type made by Oak (Industries?), that works well

Don't bother cloning, unless you can get the right board material. I believe Tek used polysulfone for all high speed, high-Z attenuator boards. You'll also see it used in microwave stripline

Hi John, No, import taxes are extra and are displayed separately. However, GSP doesn't charge service fee (UPS or Fedex charges something like 20 euros for that!). So all in all, I would rate GSP as

Hi Martin, I admire your passion. Now that I am retired I have all the time in the world to pursue quirky things that catch my attention regardless of how practical they may be. I hope you succeed in

Hi, The eBay GSP shipping price probably includes local import duty and taxes. Regards, John

Dennis Tillman advised that the book is still available from its author Pete Keller so even though I found the copy I upped to my site

When I had the Jettronic 535 clone I found several places where they had changed the circuit, because it didn't match the 535 manual.  I got it to work but never quite right. The Lavoie worked until

Just for information, this book is available for download at: https://archive.org/details/keller1991cathode-ray/page/n1/mode/2up It is open-source and thus free to download. Whether this suggests

Last year I was lucky enough to find a Tek 7704A scope on CL for free! The scope came with 7A12 and 7B523A plugins. Wanting a 4 channel scope I found another 7A12 on eBay but it turned out to have a

Yups. I can't explain that, except perhaps you're not looking at the right part of the DAC's output. The DAC is used for other purposes than just refreshing the S&H analog voltages, notably it does

Hi Bill, Thanks for posting these. The reworks look really good. At my end the link to The Cathode-ray Tube Document is not working however. Cheers, Tom

Hi Siigi. " I did the math and I'm 90% certain that your R2015 is not connected to pin 14 of U2101" ---Using a DMM I could confirm that one end of R2015 is indeed connected to pin14 of DAC and it