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That was probably about the 2N3055(A), it comes up regularly. --Toby

On Wed, Mar 24, 2021 at 11:01 PM, Jeff Dutky wrote: > > 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

1 + -1 = 0 Unwanted noise is a side effect of amplifying a desired signal. The ratio of internal noise to desired signal is greatest at the first stage of amplification and magnified in further

To make it more confusing at my A1 board (version -06) jumper P600 is connected differently. Anyway I thought to remember the same problem. I tried a 7704A with 7S12 and 7A26/7B80. With P600 in "as

I am as intrigued by Dave's comment as you are, Raymond. I have never seen a production JFET that wasn't built in a planar process. They existed, but by the time the 465 was in design, non-planar

Jim Yes, they are film caps - The grey ones are Vishay rated at 440VAC, and the red ones are Wima DC. They are all for use on ONLY the PSU block, which as we all know has the original prone-to-explode

What does that mean? I know glass passivation but "filled"? Raymond

I noticed this a few days ago, when I observed the unlocked variable timebase knob and had to fine-tune my settings in order to get exactly the screens that Ondrej showed in his video, so I wrote and

The manual I am working off is [this one](http://w140.com/smb/7s12_hi_sm.pdf) which lives in the 'smb' folder on Kurt's w140.com website. You are right - Q690 and Q694 are reversed on its diagram 7

Wes, If you're watching this group and thread still, I found another disfunction that was confounding the trace: The vertical amp input, Q4402, was dead, and caused the vertical plates to be stuck

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