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I noticed the same resistor, also open, on my 561B! On Thursday, March 25, 2021, 11:18:00 AM CDT, cmjones01 <chris@...> wrote: I've just noticed something odd about the calibrator outputs on

Pardon if I was speaking too off the cuff and using language or wording that was inaccurate, misleading, or wrong. I'm a newb at this TekScope thing. By passivation I meant the material used to fill a

I've just noticed something odd about the calibrator outputs on my 535A scope and 127 plugin power supply. They both have a 0.25R resistor in series with the calibrator socket's ground connection. The

?Surface contamination is a major issue in semiconductor fabrication and use. You *must* coat the die (with something that is super-clean) or evacuate the can. In the Germanium days, the coating of

Add me to the list of those who are confused. -- Michael Lynch Dardanelle, AR

I remember the goop-filled Ge transistors, like OC-, AC- and AF-'s (I am European, so Philips, Valvo, no 2N-). The first time I heard about oxide/glass passivation was when the term "glassivation" was

OK, then I was not imagining that this discussion had occurred. I was wondering if this could be a similar situation? Your thoughts? Thanks! -- Michael Lynch Dardanelle, AR

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