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In this video I think I know what is happening. You have variable horizontal knob out (time 0:13 in the video). Your 5ns B gate is 300ns wide instead of ~ 130ns Raymond measured so this is supporting

Sean, I would use Mouser or Digikey. I trust both of them. I don't trust E-bay or Amazon for electronic components. GOD Bless and Thanks, rich!

Jeff, Thanks, maybe I'll go with Mouser. I order stuff from them with some regularity, and that's not a horrible price IMO. Amazon is right out...too much counterfeit garbage. Though it might be fun

Sean, Or Amazon: https://www.amazon.com/s?k=2N3442 I'm not sure Amazon is really any more reliable than eBay, but just so you know your options. I did find 114 count 2N3442 and 951 count 2N3442G in

Jeff, Yes, indeed that is the part number on the transistor I removed. I'm figuring a plain old 2N3442 that is free of defects (I have curve tracers and the test fixture for this case style) should

Sean, I've been trying to find what the selection criteria were for Q1197, which is Tek part number 151-0209-00, if I am not mistaken. The service manual does say that it is selected from 2N3442, but

Thanks :) While comparing the S-1 to the S-2, I discovered another reason to prefer the diodes I used.. I was swapping cables around and plugged the avalanche pulser (at least 10 volts) into the S-1

Congratulations on getting it all working, Charles. Another victory for persistence! -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA

Thanks... but I broke the nylon holder, and those diodes are rather prone to destruction (which is how I got the S-1 in the first place). Also they are REALLY tiny and I just don't have the mechanical

You can find the likely part numbers for the original diodes in the "Tek schottky Diodes memo" in the reference materials files on Tek Wiki. Specs for many of the part numbers are in section 12 of the

When I replace these resistors I replace the high value ones with two resistors of half the value in series to split the voltage drop. They seem to last longer that way.

Thanks, Ed & dan. I will check R18 in particular. But I apparently have overthought the problem. It's mechanical, not electrical! I posted three pics in "Sampling with 3S2" (and set the order to most

The following photos have been uploaded to the Sampling with 3S2 ( /g/TekScopes/album?id=261250 ) album of the [email protected] group. * 0324211757-00.jpg (

Hi Charles, I have had multiple S-1 and S-2 heads with transient responses that could not be leveled. In all but one case, the problem was caused by R18 that had drifted high by 100% - 150%. It also

Quick update: I was able to remove Q1197 from the +75V regulator circuit quite easily by loosening the power transformer and taking the rear panel off to go in through the fan opening. Threw that bad

What is the B sweep voltage level when there is no sweep? Both A and B sweep are expected to reset to +13V and should go down from that level when gate starts. When you say it doubles does it always

... or it was wrong in the Rev. 1985 manual? There the schematic says Q694 is NPN while the parts list says PNP. It's long ago that I ran into this. Albert

Hi Richard, W.r.t. to your final question: Which manual are you using? In my paper manual (rev. March 1984) the labels Q690 and Q694 at <7> are wrong (interchanged). The internet pdf (Rev. March 1985)

Hi Bert, Thanks for supplying your experience. Yes, I may be going overboard, but the long repair stories on the EEV Blog bring out the preventative engineer in me! The RIFAs capacitors in my input