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Oops. The thread: https://www.eevblog.com/forum/repair/renovating-an-early-tektronix-475-oscilloscope-a-few-random-hints-and-tips/

Martin, One other thought is compare the cabling to the service manual. I have often seen 271x's that don't work and when someone got into them and found a bigger problem they just closed up the unit

Scroll down this thread a bit. Good picture of the cap sitting in front of the 1/4" nuts holding A1 (& A2, CH2) to the face. But this is for a 475 and those lucky bastards have a plug in cap. But

Great info. Thanks. If I cannot get that capacitor block to settle down, I will have to get the board out. I will let you know. Ananda

Greetings, A close friend of mine, who is an electronics engineering tech, owns some nice 3D printers as a side business. If there is interest I will give him a “heads up” and offer his contact

Yeah, the delay line definitely needs disconnecting, among a couple of other odds-n-ends. I don't have my notes in front of me. One of the gotcha's that almost got me is the ground strap that goes to

My main pleasure with equipment is finding inoperative or basket cases and restoring them. I just finished a 2230 and an R-631B. This is an account of the projects, skip now if you aren't interested.

Dave, Thanks for the write up. Did you disconnect the delay line as mentioned in the manual? I may have to pull the board after all. One of those capacitor blocks that are plugged in seems to have a

Well, I've presented quantitative calculations explaining why capacitance matters in this circuit, and thus why series combinations are helpful. In rebuttal, you provide "but they might still have

Again, I am not claiming that they were perfect (7A12 disaster is one example). What I am claiming is that the likelihood of a resistor power miscalculation is small, especially in the A version of a

OK. I have enough trouble already. If you want me to print something, send an email to tamhan aeht tamoggemon point com. With an included STL file. Then I check if I can do it and will report back. I

Just because they documented their fix for a mistake doesn't mean it isn't a mistake. You can gain more wattage in a pair of resistors than you can in an individual resistor in the same board space...

Perhaps Tom, but I have seen many instances of them doing just that. U800 as installed on the 2465 was built to handle much higher wattage, and a heat sink it didn't need. When they decided not to

Ah, not so fast, David! You happened to have chosen an example that illustrates a larger point, but not that there was an oversight in a power calculation. First, in my sm, R724 and R725 are not 499

Actually $1200 is completely reasonable IMO. I sold mine for almost that much 15 years ago and i've seen at least one that sold for almost double that. Like the prices or not but the really unique

"If not for FleaBay, then where else can one obtain these old scope modules?" They show up pretty regularly at the surplus stores around here. I just bought two TM500 (DM502 and FG502) plugins for $5

David Partridge wrote: So, while I'm in here, and planning to replace these two resistors, should I increase the wattage? I expect that these are carbon composite resistors (but certainly don't know

Pictures of my enclosures are here: /g/TekScopes/album?id=244462 Michael Lynch Dardanelle, AR

sadly they did make that very mistake quite a few times! Witness the 7904 vertical board ... R724 and R725 (499 Ohm 1/2W) always run way too hot (burnt fingers hot) and are often well off value from

The 465/475 box is an almost exact replica of the original. Modified the mounting to make it easier to install. -- Michael Lynch Dardanelle, AR