someone has the internal characteristics of the original diode?

While cleaning soot off of everything, I pulled the CRT connector off the back and an orange plastic segment crumbled to dust. The connector still has a visible key but the CRT doesn't, so I guess

Vias are free and reliable for signals at the speeds of this board. Use them, is my advice. Also, I suspect there is a systemic problem with the connectivity to the ground pour, I used U520 as an

Thanks for your response , I have tried this but it does not show an intensified brighter area, it does show the waveform as either all intensified or not

Hi Albert, Oddly, I powered it up again this morning and the rails are much closer than they were last night. Lamps voltage is slightly low (tenths of a volt) but, otherwise, they look very close

There is a tiny knob on the front panel by the Timebase B controls. That needs adjusting fpr effect. Tim

Andy, I got the u520 pad to connect. It did not line the tract running from the bypass cap over to the pin for some reason it is all ground but it did not want to connect to the ground plane. I am

Barry, too high +5VL can be an issue since this is used in the balance sense against -17V. Albert.

To follow up on this, I built a load resistor array (similar to the one Dennis detailed). That helped me isolate a few more transistors that, while tested "good" out of circuit, weren't working as

Hi there I am currently restoring a 547 and it almost all works … the delay time multiplier seems to work and in alt mode I get both waveforms but the region which is intensified is not any brighter

Why this conclusion Roy? I would think of to large vertical readout gain, and try to correct that with R2291 (mentioned by Roger). In case of (just) wrong offset there would at the same time be a

Jeff With readout control fully clockwise I suspect the readout is actually offset vertically because there is a faint brightness at very top of the crt (just out of the visible area). If you reduce

Roger, Does that mean that the readout lines are actually positioned relative to the vertical center position? I'm a little surprised that top and bottom readout separation was not made a user

There are two adjustments that affect the vertical position of the readout. R2291 on the readout board sets the vertical separation of the top and bottom readouts and R403 on the vertical amplifier

One note, while checking the artisanal chip carrier against the other sampler board (to make sure that I had the diodes oriented correctly) I noticed that the forward voltage drop for the HSMS-2822

Tom, Wow, that's pretty impressive, though I am reminded of the old saw "Q: what can you make with an unlimited budget and a dozen grad students? A: Anything. Q: How many can you make? A: Exactly

Jeff, Yes, that's the sort of magic box I've been fantasizing about. One of my doctoral students took a fairly serious stab at some of it, years ago. The idea was to do direct-write lithography (he

Tom, I assume that by "magic toaster oven fab" you mean a device that takes CAD files in one end (along with some packaged raw material components) and spits out a fabricated chip on the other side.

I addd three more images to the album (https://groups.io/g/TekScopes/album?id=267375), showing the artisanal chip carrier with solder paste and the HSMS-2822 in place before soldering, then after

Something is not right with the ground pour in the rev 4 drawing you uploaded. For instance pin 7 of U520 only connects to the ground plane indirectly. I am not a kicad user, so I cannot begin to