开云体育

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

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