Chuck wrote: " What I generally find is that out of 1000's of 5% resistors, not a single one was within 1% of its nominal value. But, all were within 5%." These two-lobed distributions are common.

When tektronix said a part was selected, they didn't usually share with us why. I would expect that the listing meant the technician was to try out transistors from the bin until one worked... for

And we mustn’t forget that database and documentation technology in 1975 (or whenever it was that the SG503 debuted) involved much more manual labor than today’s technology. “I just want to add

Dave wrote: "$10K just to pull a new part number???" That's way on the low side, when you consider the overhead, to administer a part number, and the physical logistics involved, for a very long time

It is not recommended to plug 50 ohm N connector (central pin) into 75 ohm connector (central socket). The larger diameter 50 ohm pin will stretch the smaller diameter 75 ohm socket. This may (will)

From the: Replaceable Electrical Parts-DM501 Q152 151-0192-00 TRANSISTOR: SILICON:NPN,SEL FROM MPS6521 80009 151-0192-00, This says for Q153, "SEL FROM MPS6521," ... which means to me ... select the

$10K just to pull a new part number???  I guess it depends on what it is and where/how it's used and how inefficient the documentation system is.  I've created complete documentation packages,

And now resistors are ordered from Hi-Fi Collective. I found they have a large stock of Allen Bradley resistors for a decent price and good shipping rates, so once they arrive, I'll be able to get

In the 75 Ohm vs 50 Ohm world, the two are completely interchangeable as far as mating is concerned. The 75 Ohm BNC connector is missing dielectric between the center pin and the shield. Based on this

I love it! I have lots of 12 AWG 14 AWG for tying, mini rivets occasionally, better than baling wire, and now for pots it will hold tight when folded over and clamped/crimped some.

do be careful on bending the wire as it may break out a corner, usually upon removal when putting in the correct/ more correct screw..do not ask how I know...but it was eons ago on another project

My next step is finding a 1/8W 47ohm carbon comp resistor or two... Tiny things, about 4mm long.. I don't think I'd even be able to find one in Akihabara here in Tokyo... seems 1/4W and up are far

?We were strongly encouraged to use parts already in the Common Design Parts Catalog. ISTR a new part number cost something like $10,000 in administrative overhead. Dave Wise Information Display,

Yes, I have a number of RG-62 with BNC jumpers, about a meter or so long, in my pile. Wondered what they could have been for... As I recall the BNCs mated OK with my 50 ohm stuff, but now I am

Dennis, Chuck, et-al, thank you for the input and elucidation, it has been quite helpful. Unfortunately it appears that my display board, not the transistors that drive the select lines, that is the

Hi Dennis, I don't recall how the Bourns pots look inside, but with the A-B ones, you almost can't go wrong. Once you figure out how they did the modular construction, you don't have to fear taking

Hi John, Your speculation might  be reasonable for LR142 vs LR150, although I think that it is more likely that Tek used LR combos that were already in inventory, rather than endure the paperwork in

Looking at the schematic, there are a number of LR's and they are wound on different value resistors. Noting that LR142 and LR150 are both 0.25uH/51 ohms and LR135 and LR19? are both 2.5uH/2560 ohms,

Hi all, The resistor in question is definitely 47ohm, I was able to read the colour code on the resistor, so I assume it is required for damping or the like instead of just a former. I think I'll try

On hfe and other transistor parameters: What Dennis says is 100% true. But there is a little something that you must remember for early manufacture, and early uses of transistors: They were very,