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I have a pile of old IBM and Telex terminals from a local school system when the state moved away from old IBM mainframes. They are stored in my garage, but I am unable to get to them without help.

Carbon Composition resistors absorb moisture. Bake them for a while before tossing them out. Also, high value resistors require voltage across them to work at their marked value This used to be

I have just checked input resistances on a working-to-spec 7A26, the results are quite unexpected!. If I use an analogue meter and have the 7A26 powered off then in the 10mV position the DC

I thought about this a bit, with the huge volume of paypal transactions every day across the world, the actual number of horror stories would have to be a fraction of a fraction of a percent.

I don't recall seeing it in any Service Manual, but our good friend H?kan has produced a document on the topic: http://www.hakanh.com/dl/docs/hardtofind/dtmsettings.pdf Colin.

Once I had the same issue with the 492 attenuator. Taking it carefully apart, one of the wafers was burned. I was able to manufacture a wafer myself, using very thin teflon laminate and 0402 SMD

OK, yuzz made me look. I found the schematic for the 475A, and my quick assessment is that there's nothing special about low capacitance or inductance or precise value of the R1356/R1544 combo. I also

Colin and Juoko, If the 7A26 is arranged anything like the 475 then cleaning the AC/GND/DC coupling switches is almost exactly the same as cleaning the rest of the attenuator switches: soak a narrow

Wish I had kept my Commodore PET/CBM systems... -Dave

John Goller wrote: I don't have particular issues, other than complaints about this particular process (not being offered the options that would have made this process easy), and about the quality of

Hi Jeff, I've only taken a quick look at the circuit, but it doesn't look overly fussy about the exact resistance value, so the carbon comps you bought are likely to be fine if they are still within

Dave, Thanks. I saved the URL. Ananda

Tom, Yes, I had anticipated that these NOS components might not have retained their specified values. I've been going through my father's effects while working on his scopes and finding all sorts of

Jeff, I don't know what the circuit context is here, but if carbon comp types were originally used, then the exact value isn't that critical. If they have drifted badly (typical after many years), and

Hi Jeff, You are correct that, depending on value, metal film resistors can have significant inductance (relative to the carbon comp version). In this particular circuit, though, you are looking at

Colin, I've looked at five different scopes with a delay vernier and only one of them (a 2215) seems to be set at something other than 0.0 at the extreme CCW rotation. All three 475s and the 475A that

Mark, Call me Michael, I have not designed or printed anything other that these two, mainly because I have not had the need for anything else. I would be glad to try to help with other enclosure

So I feel like a superstitious/nostalgic idiot, but I had second thoughts about replacing the out-of-spec resistor pair with modern metal film resistors. I went to eBay and bought a dozen (allegedly)

I've seen plenty of design errors in all makes of equipment - nobody's perfect. When it comes to high bandwidth circuits like in scope amplifier chains, you may have to cut them some slack. It is a

Mr. Lynch, The photos of your enclosures are nice. I am glad to see a supplier that has these cases for those that have bad multipliers. I brought it up since some have said their multiplier is bad