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He does, according to the legend with the image showing the glass seal with the leads protruding. Of course, that's got nothing to do with passivation of the chip inside, apart from providing a

Sigh. Tom Sent from an iThing; please excuse the terseness and typos

My guess would be to save the calibrator from a backed signal (feeding an external signal into the calibrator, AC or DC). Don Bitters

?Exactly. High-gain plugins (Type B, D, etc) were seeing hum on the calibrator. The resistor made the bottom ranges usable. In the 535 Mod Summary, it's Mod #1412, effective S/N 5001. Dave Wise My

I found a set of 4 on eBay that are supposed to be NOS and tested good: https://www.ebay.com/itm/313344479069 These match what's called out in the SN<250K service manual: 152-0125-00, 4.7mA, 15pF. Not

?Dave P, that bottom view of a TO-72 is only epoxy sealing the annular joint between header and can. If that's a Silicon transistor, most likely the can is full of inert gas and the die is passivated

ADDENDUM Grid/Feedback/Cathode caps that are short enough to lie on their backs can be installed that way. The baseplate is 70mm wide. T1 is 26mm + 3mm for wire bends. The feedback resistor string is

Dave, I've had a search through the CDPC (Common Design Parts Catalog) for the tunnel diodes (Tek PN 151-0386-00) in the 465. The service manual says that they are selected from 1N3718, but the Tek

Yes, the intensity modulation of the 7A26 trace by the dot-blanking leakage is only noticeable when looking at a signal which is related in frequency to the 7S12 sweep. In my example, I'm looking at

Dave, A picture is worth a thousand words. Thanks for clearing up the questions. -- Michael Lynch Dardanelle, AR

I was going to offer to send you the "same device" from a 453, only to discover that it's a 2n3441, i.e. smaller TO 66 case! (The 453 has a shunt resistor across the transistor which is either to

Could he mean the glass lead seal where the leads exit? Leon Robinson ?K5JLR

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