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Swapped a ref102 from the positive rail PSU while turning it off. Now measuring -259.27 for the -260V rail and confirming the problem was a malfunctioning ref102, so the PSU is now fully operational. Will let it run for several hours. Any procedure for load testing it? Kerry, JoaMat, James, Craig - thank you very much! Now off to making the umbilicals and finishing the amp 🙂 soldering the LEDs next - anything special about testing and matching them?

Good race in France, kept me at the edge of my seat till the last lap. Disappointed with the outcome - I was rooting for Hamilton. Seems like Mercedes need to work on their pitting strategy. It has costed them a couple of races just in the last few weeks.

Are you still waiting on this Chris? I'd definitely leave a bad review!

Umbilicals - takes more time than you might think! IIRC mine took a solid 8 hours plus. Because the heater feeds to the power tubes float at -500V I ran the wires inside an insulating sleeve in the umbilical. Glass fiber I think... Well done with the fault diagnosis BTW - nice job!

Thanks Ric. Blue Joni Mitchell 1971 & Blue 50 (Demos & Outtakes) Joni Mitchell 2021 Example - of the entire EP posted to her YouTube page:

I have no idea where my fiberglass sleeving came from - but it was almost certainly Farnell or RS. Mine is black. I'd have to root around at the back of my rig to measure precisely how long my umbilicals are - but three or four feet, no more than that.

Feels So Good Chuck Mangione 1977 Non-title track example:

Phew, completed the wiring. Thinking about wrapping the wires or leave them as is for better cooling.

That’s great news. Congrats. I just use resistive loads mounted on heat sinks. Make sure they can handle the power and voltage.

Great! Looking at your measurements of ref102 I suspect you might have the problem there. You should have a potential at Out (pin 6) of 10 volts above -562V - that will be -552V and not -532V. You have a spare ref102?

Mozart: Violin Sonatas on Oboe Olivier Stankiewicz, Jonathan Ware 2021 Example:

When I was in fifth grade, my class took a field trip to the George Eastman Museum, in Rochester, New York, as the fifth graders at my rural elementary school, 30 minutes south of the city, did every year. Housed in a Colonial Revival mansion built for the founder of the Eastman Kodak Company in 1905, the museum is home to one of the most significant photography and film collections in the world. But our job there was to stare at old cameras the size of our bodies, marvel at the luxury of having a pipe organ in your house, and write down what a daguerreotype is to prove that we’d been paying attention. At the end of the tour—in a second-story sitting room full of personal artifacts—we were presented, matter-of-factly, with a copy of Eastman’s suicide letter, dated March 14, 1932: “My work is done. Why wait?” Eastman shot himself in the heart with a Luger pistol at the age of 77. https://www.theatlantic.com/magazine/archive/2021/07/kodak-rochester-new-york/619009/

RIP, George Stranahan, Pilgrimosopher and Benefactor of Physicists & Bar Flies A venturesome millionaire, he forged an only-in-America career in fields ranging from craft beer to free speech activism to scientific research. https://www.denverpost.com/2021/06/20/george-stranahan-benefactor-of-physicists-and-barflies-dies-at-89/amp/ https://www.nytimes.com/2021/06/20/us/george-stranahan-dead.html https://www.aspenhalloffame.org/inductee/george-stranahan/