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Some minor fitting and stuff says that either the TM500 shell will work (best), or the TM5000 shell (likely less available).? I think that the 5000 series scope extrusions are the same width and have

Michael, I have for many years and many projects used Sunstone Circuits, located in Mulino Oregon. They do excellent work and have great customer service. They accept Gerber files and also have their

I did all that, saw the .zip get built and then ? ? where the hell'd it go? Bill

In my view, the guy is a skank livin' large in audiophool La-La Land. Not that there aren't differences amoung tubes and not that some aren't demonstrably better than others but $US500.00 for a used,

The email active link was missing a final character; when that was included, the link works ok. And, I was successful downloading all the data. I do agree the download command is somewhat hidden. You

Jared, Where did you get the extruded aluminum panels for the top and bottom of the unit? Were those reused from another module, or is there some way to get new parts? -- Jeff Dutky

I just spent 10 frustrating minutes cursing the genius Google geeks who hacked that can o' worms together and fronted it as a done deal. Bill

A nanosecond just isn't what it used to be... :) --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu

I've been trying to run through the calibration process for the 475A that had a blown Z-axis amp, and I've run into trouble right off the bat. I was unable to get a visible spot on screen at the +15 V

Ok, I'll ask OSH Park for a quote and compare quotes. Larry -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland)

Why would using Chinese made boards require a different physical design? The author, Jared Cabot, used PCBWay, surely fab'd in China, and provided Gerber files for each of the four PWBs. Since several

Here's a nice video of (Rear Admiral) Grace Hopper demonstrating the "size" of 1ns in vacuo: a piece of wire 11.8in long. In a cable it will be shorter, due to the reduced speed of light.

Yes, I have used OSH Park before as well.? Not sure where they are located, so I hesitated to mention them.? I try to avoid sending any of my dollars to China these days.? ?JimSent from my

Yes, finding oddball crystals is a challenge. I very much doubt that you will find 52.5 (or 55, for that matter) MHz crystals as standard stock items, so your choices are limited. If you can't find

Oshpark is very good, with 3 board per order for the price of 5 dollars per square inch.? I should point out that the board set I saw would be rather expensive. Their boards are purple, and ENIG

Several at least here in Southern California.? For just this type of small order.? For volume production, China is of course the 800 pound gorilla.? Check out Advanced Circuits, TTM, or Summit here

wrote: I tried cryogenically treating the tubes in a 561A Now all my sine waves look like so... https://images.assetsdelivery.com/compings_v2/natareal/natareal1406/natareal140600036.jpg I'm not sure

Are there any US PCB Houses that we could contact? Or are they all in China? I have never done boards before. I would be willing to help out with the process. -- Michael Lynch Dardanelle, AR

Yes, -Dale

The final "-" was missing in the hot link; with that added, the link works. Larry