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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

I have designed and printed several for the 465-475 etc. I also have printed a stand alone box for 455/475M as well. I can supply an STL for either one. -- Michael Lynch Dardanelle, AR

encapsulating the HV multipliers is easily done using a "Potting Shell". they are available cheaply off-the-shelf from many vendors, here's two examples: https://www.polycase.com/potting-box?p=2

Hello, how big are they. Tam -- With best regards Tam HANNA Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/

Colin Herbert wrote: Is this covered in the service manual? I would be interested in knowing how this needs to be set, as I am planning to move the guts of one 475 into the frame of another, and that

David Collier wrote: How did you straighten the shafts? I mean, other than bending them, did you do anything special? I've got two parts scopes that I'd like to make into one working scope and one

I was wondering if anyone was willing to make the boxes for the multipliers so ones that go bad can be made. The box would need the holes for the wires and mounting threads as original. The old epoxy

I am looking for the schematics of the two military scopes. I prefer paper or print-out. Thanks. Mark

Ah, thank you Colin. I was wondering about that. My working scope isn't at 0.0, and this one wasn't either. And I have no recollection of what the Army scopes were set to. I can get close 'cuz I do

Chuck Harris wrote: but this resistor pair is present in the schematics, not just for the 475A, but also in the early 475 service manual schematics. I know that's not really a refutation of your

In a word, no. Anything is possible, I suppose, but asking us to believe that Tek's design team carelessly forgot to check power dissipation is a lot to swallow. This wasn't their first rodeo --

Your other problem is setting the Vernier where it is supposed to sit when you put it all together again! They don't all sit at 0.00, There is data about where they are supposed to read when the pot

Thanks Tom, Raymond & Jeff, Yes the trigger slope shafts were bent as well! Now straightened. Display is bright, and power supplies are well within spec for residual hum. All electrolytics are

If it does turn out to be a blown attenuator, perhaps the best option is to use an HP attenuator instead (they are much more available). A small bit of logic is needed to remap control signals and