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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

Larry, I am interested in a group buy of the board set. Thanks, Shaun M.

Yeah, I could be convinced into a set. Board costs aren't so bad, but the shipping can rack up some charges. If you can get a quantity at least it works out to something reasonable per board. Then

Gosh, the link to the google drive Gerbers does not work for me. Anyone have success downloading the various files? Larry

I would be. I would want someone with experience dealing with a PCB House to make it happen. -- Michael Lynch Dardanelle, AR

I wonder how all of these vastly different tubes are all used in and every one "sounds wonderful" in his high-fi system? I don't know much about tubes, but I would think that each different tube would

Anyone interested in buying sets of boards to share? Larry

Hi Attilio, The 52.5 MHz crystal in the TR502 is Tek p/n 158-0098-00. According to the Common Design Parts Catalog, this is a +/- 0.0005%, 3rd overtone series crystal in a TO-5 case, with a maximum

Brenda, He did not state the PCB house in the original post. Must be in the video and I do not have the ability to watch the video at the moment. Thanks for supplying that information. -- Michael

Don't you just love these guys? unbelievable! -- Michael Lynch Dardanelle, AR

No, "Audio Dumfuks" is more accurate. I'm seldom one to directly contradict but occasionally needs must. Follow -this- thru to see what some pikers get for USED tubes, no guarantee, no returns.

Hi Jared, very impressive! Almost makes me thinking getting some of the TM500 series! Michael, Jared stated that PCBWay did the boards and I am very impressed with the boards. Has me wondering if I