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Some progress. Just now (in Italy it's 9.40 p.m.) I carefully measured the parallel R65/R68 with my Fluke 8040A, with a reading of 3.3 ohms. No good. I carefully soldered a 3.9 ohm resistor, the only

Hi Dennis, I get that you like puzzles, and that explains my interest very well. I would suggest that you will have more luck if you follow the ICE direction, though. As you are probably aware, an ICE

I found these at DigiKey: https://www.digikey.com/products/en?keywords=NTE%20TP0001 Note that they are an insulating pad which it sounds like what you originally found. For boards that connect to the

Hi Chuck, I understand exactly what you are saying. Call me crazy. But I have disassembled enough firmware to know how to tease out all the information I need to eventually understand everything it

Bergquist (now Henkel/Bergquist) manufactures an array of thermal management products. One of these, “Silpads” is a product I have been using for replacement purposes. It is a flexible, rubbery

Hi Albert, these are the effects of work fatigue when I get home.... Here is the correct phrase: "The pot R90 (trig level) is almost fully CLOCKWISE (it's in the original position when I bought the

Page 5-48 of a widely accessible version of the yellow book says 342-0082-00 is alumina. Were it me, I's use silicone pads under all the transistors on that mounting bar. They're series pass elements,

We see cases of berylliosis (the beryllium lung disease) around here because there were a couple of aerospace manufacturers in the area. Beryllium is widely used in aerospace applications because of

Hi Max, Those pictures helped me a lot to understand what you previously said in words! Just for comparison I added an annotated picture to your album (and somewhat destroyed the order). You said R90

hi, When I turn on the 420a, it give out -for just 30secs- a strong smell of rubber/car tire that disappear fast (no errors reported though); I think the caps are in need of a swap. Does anybody out

Beryllium ceramic is fascinating stuff. We all would use it a lot more but for the liability issues. It feels a lot like aluminum in that it draws the heat away from your skin very quickly, making it

There exists (existed?) a product called beryllia microspheres which can be used safely to increase the thermal conductivity of epoxy, silicone encapsulants, etc. They are also suitable for mixing

I have some pink tinted alumina TO3 insulators as well as some blue tinted beryllia ones from the 1970's. The beryllia ones are much colder to the touch than the alumina ones. Bruce

That is correct. If I went with the mica, I can always use 2 pieces; I ordered some anyway, it's quite cheap at Digikey. I guess a bonus is that it's unlikely to break when clamped. --Toby

Thanks as always, Chuck! These pads are under the low voltage (< 45V) TO-202 Darlingtons. Most likely I can reuse them. --Toby

Beryllium and compounds have an unusual toxicity profile. Beryllium is not directly toxic as, say, arsenic is. However, how it harms you is to cause an intense allergic reaction. In the lungs, this

Hi Dennis, Have you ever used a software logic analyzer of this sort? I did at one of my customer's locations. They spent a gob of money on a set of software personality modules for their 1240 logic

It probably shattered when it was tightened. It will do that in a blink if the aluminum under it is not perfectly flat. I would goop it up, and put the pieces back into service. I you can't, or are

It has been reported that Tektronix used BeO ceramic all over the place. Some common examples are the heat sink insulators for the 5000 series H and V output transistors. They also used it as the heat

Hello Saroj, sorry to hear about the breakdown of your replaced parts... :-( Since you already confirmed that the scope worked when fed from a secondary power supply, and I assume it still does? If