I have a few questions about power supplies and would like some opinions. Are switching powers supplies inherently harder on components than linear power supplies? If you picked up a 70's-80's

Hi Reginald, It is in the archives: https://groups.io/g/TekScopes/topic/7659008#141241 Enjoy. Egge Siert

Because there is a mismatch between the high plate resistance of the output pentodes or tetrodes (about 4.5k-ohms in push pull) and the loudspeaker. The impedance transformation goes as the square

Gentlemen... have a look here: https://groups.io/g/TekScopes/message/155394?p=,,,20,0,0,0::Created,,egge+siert,20,2,0,30465052 Albert

Through the tube era and the discrete solid state era professional balanced audio lines in radio and recording studios were also impedance matched at 600 ohms (earlier 500 ohms) because they were

The user manual I quoted has a revision date of May 1989. The August 1988 service manual states the calibrator is < 35 ps. The February 1989 revision page states the same rise time. As I noted

Thanks Craig... so, if I were to summarize what you wrote, at such short distances, there's really no opportunity for a reflected signal to go out of phase with the incident signal? In watching the

They must have changed the cal output circuitry on the later models.

It is to do with the frequency range. As soon as the length of the cable becomes a significant fraction of the electrical wavelength in the cable, you need to impedance match. That is because energy

Attachments are not allowed here Reg. Via the website you can create a new Album in the Photos section and put your picture(s) there. If you do so, it's handy for "us" if you insert a link to the

That was a decent video, thank you. It doesn't seem like he had problems with the terminators themselves. In fact, he uses them to address mismatches. I'd be curious to know (from anyone who knows)

Thanks. It will be a while before I take it apart again, but I'll make a note in my service manual. Fortunately, most of my HP gear lists the parts in the manuals, so those will be easier to

I may have to take part of that back. In my F/W EPROM collection I don't have 11801 but there is a note saying that 11801 can also use 11801A F/W which I have and it uses both types. I now begin to

27C010 and 27C512 /Håkan

Far as I know he still works at a university in Portugal -he's been there for some years and is well known in scientific and amateur (especially EME) circles. 73 Dave, ZL3FJ

11801 User manual p 42. "The signal from the calibrator output us a 250 mV square wave with a rise time of approximately 20 ps and a period of approximately 10 microseconds." After I did the

Hi: If you haven't watched EEVblog #652, he demonstrates a couple of problems that can arise when using coax, terminators, and Ts, to connect a sig gen to a scope. Cheers.

Great! Calibrator risetime? Isn't the cal output specified at about 250ps? Both of my instrument measure it about 300ps.

He clearly knows what he is doing. You don't knock up something with an Altera FPGA unless you have a major development lab at your disposal https://www.qsl.net/ct1dmk/gw_04.jpg Craig

Yes, Luis has done great work! He is in South America I think. Ascertaining and sourcing the correct parts can be difficult.