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I'm pretty sure I understood what Raymond was saying. Raymond always writes very clearly: 1) Scope plugged in, but turned *off*. 2) A5 board installed in scope. 3) Desoldering, and resoldering NVRAM.

Here is a capacitor I am trying to fit https://www.digikey.com/product-detail/en/united-chemi-con/EKMR251VSN182MA45S/565-3686-ND/4303971 And here is a picture of the board and detailed caption below

Thank you for the refresher about the Dallas NVRAM control chip. I believe you are correct, but it's been a lot of years since I designed one into a circuit. I think you misunderstood Raymond's

Hi Raymond, I was curious, do you have any direct experience with Dallas NVRAM's losing data from desoldering grounded boards? The reason I ask is that the Dallas 1225AD NVRAM contains a special

Hi Nigel I have both knobs. They are also used on the 475 and 475A. Please contact me off list at G6HIG at Yahoo dot com if you want the knob. 73 George G6HIG

Depends on your concept of inner and outer (concentrically, or front-to-rear)! What I need is the larger diameter ribbed grey knob, no-skirt, and with a white stripe for trigger level adjustment, not

As Colin says: Depends on what you consider "outer": longitudinally or radially with regard to the shaft... As I mentioned earlier, the part no. refers to the ribbed knob for trigger level, not the

I think you might have a different idea on "inner" and "outer" to the rest of us with regard to concentric knobs. I believe that the knob Nigel is looking for is that with continuous rotation (i.e. a

Hi all, I just found one and it is coming to me. Also found the corresponding cable that belongs to it. Thanks, Un saludo, Leo (Satbeginner)

Thanks, here is some more details Tektronix 577 power supply C744 1700uF 250V, the capacitor has a 4 point triangle mount on the board

It's always sad when a great one off place like that goes away. Oh well. I'm not in any huge hurry to obtain a 500 scope...I'm going to be patient and keep my eyes open. In the meantime, a curve

I'm in the same boat regarding the general unavailability of Diamond 3.5 patch cables. I'm sure they're out there, but nobody knows what they are. So unless you find some in a bin at a surplus store,

Hi Dave, Yes, I am sad to report that the "Black Hole" closed many?? years ago.?? I had heard of it and when I was traveling through stopped in.?? It was a mammoth place with EVERYTHING you could

Thanks, Dennis.? That looks about right.? 1.5 ns corresponding to about 1 foot of fiber prop delay.IIRC, we used ST and FC/PC fiber connectors back then.? I think my OIG502 had an FC on it.? I'm

Hi Jim, I uploaded another screen shot into the album I created last night. The album is at /g/TekScopes/album?id=94144 The photo is called 7) S-42 Internal Reflections. It shows what

The Type 774 connectors were used on many GR instruments from its introduction in 1941 until it was supplanted by the Type 874. The 774 was a constant impedance connector which was used for the

Such a shame...thanks for the note and the confirmation. Sean

Definitely IS gone- went there specially to visit it back in 2015 (or was it 2014?) and found it basically all shut up and not much to see thru the windows or in the yard. Here's a news item about it-

Hi I certainly have the outer knob which is the trigger polarity selector. George G6HIG

We have several sizes of boards that take snap-in caps and replace the old “twist tab” and screw-in caps Regards, Stephen Hanselman Datagate Systems, LLC 3107 North Deer Run Road #24 Carson City,