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Attached ZIP-file with gerbers, shematics and some 3D views. CFA3smd.zip I’ve used both gerbers when I milled the boards (kitchen made) and that is about three years ago. Board size 160mm x 74mm to fit on Modushop 200mm x 80mm heat sinks. Take a look at the files and see if/how the boards could be a part of your project. I think one should make a few changes to attached gerbers before considering sending them to a fab house.

OK. Did a first power-up test for CRHV today. With 360k set for 550 V, I’m measuring about 554 V in practice. I only let it run for ~10 minutes. A quick IR check shows the CRHV peak temperature at ~58 °C. I suspect running it from dual 250 VAC inputs targeting ~600 V output may result in slightly better thermal behavior. At the moment, only the high-voltage section is populated. The delay soft-start and ±15 V sections are not installed yet, but they should function as expected once added.

Given the number of windings there, it has to be at least a couple of transformers. That is also clearly a Toroidy transformer, based on the color of the wires, and they never do tall transformers, they always just get larger and larger in diameter. That means it could just be transformers in there.

True, I would do independent filament PS for each 300B, probably with LDO. Ad the rest of circuit invisible from bottom - I guess the main HV PS is hidden under cover from top side. There is too much space there only for transformer.

blankets.mp4

Yeah I agree but one possible major, major issue... one filament supply per channel for a balanced amp. These are no indirectly heated tubes... the filament supply is the bloody cathode.

For me it is DC heating, look at wires at left bottom 300B, wires come from PCB with capacitors and some silicon under it.

Reviving this thread a bit. DIY itch is getting stronger. I would love to try and make a smd cfa3 with digital attenuator and protection circuit on 3 board layout. One board per heatink with the amplification circuit, and a central board with GRLV, input and output attenuator and protection circuit. Sort of what Justin did with his cfa3. Do you have a layout for your smd cfa3, and would you be willing to share it? I have played a bit with schematics editing and board layout, my idea would be to add the individual building blocks to the main board and try to make it fit a nice case such as the mini dissipante from modushop.

Industry I started watching this in the beginning and kind of thought of it as junk in the beginning. A bunch of new hires in a London bank/brokerage vie for permanent positions. Someone described the show as a cross between Euphoria and Succession, and can kind of see that analogy. It is in Season 4 now, and has gotten much much better. A lot of very unlikeable self-centered people, but for some reason I enjoy watching it. Kinda like waiting for the next car crash.

Oh yeah! And Jodie Whitaker and the rest of the Latimer family. Every time they cut to the family, just..."WHO IS CHOPPING ONIONS?!"

Broadchurch (Seasons 2 & 3) - Back in 2013, we watched season 1. While excellent, it was very intense, centering on the death of an 11 y/o boy in a tight-knit English coastal town. So much so, that when series 2 aired, we opted to not continue watching. In the last weeks, we circled back to binge thru season 2 & 3 in succession. These were just as intense as the first and reminded me how much I love Olivia Coleman's work. Definitely not for the faint-of-heart, or a casual watch. But these were the blueprint for many similarly-themed series over the last decade.

Linus Tech Squeaks have announced a new line of USB-C cables. Video is mostly fluff, because Linus. On the plus side, the cables are marked and while not TB certified, some in fact are. Given what I've paid for TB3/TB4 cables, even with shipping these things are a bargain.

I managed to build few T2 in the past few years. Just sharing pics how T2 fits in Modushop Dissipante 400 enclosure. Many thanks to Mr. Gilmore and HC community

https://www.msn.com/en-us/lifestyle/shopping/blackstone-backed-leica-camera-weighs-1-billion-sale/ar-AA1UP5Kn

I think you're safe. It's a step down soundwise, and it doesn't have the 1/4 inch thick casing. It would be convenient with the headphone amp, but I usually find those tacked on amps to be lacking.

They are very different headphones and the ES-2a easily beats in terms of price but I'd lean more towards the 009D in terms of raw performance. The 009D is really growing on me and what amazes me is how Stax can release crap like the X9000 and the 007S and then this... Both the X9000 and 007S are headphones I'd never listen to for fun while I've been logging a lot of hours on the 009D.

Damn you LAiV. Just after I’m satisfied with your Harmony µDDC and µDAC you release a new, cheap combo DAC-headphone amp. Yo Rob!

How would you compare it to the ES-2a which is about $800 cheaper?

Hell yeah, Adam! The only advice I have is get after it and as someone else I follow on Strava would say, "This suffering is a privilege." Well, maybe one more thing - don't ever worry about comparisons to others. One of my good friends from 30+ years ago rides 8,000+ miles a year (pilot) and when he rides centuries with us barely breaks 140bpm at 50+ years old. I just can't be him. I'm a year younger but have always outweighed him by 40lbs even when we're both fit. He also doesn't know how to have fun, so as usual balance is the answer.

It’d been six weeks so I dialed up empanadas again.

Slowly but surely continuing to improve. I've got a long way to go before I can challenge Nate for FTW (w/kg I have no chance), but its amazing how much a little bit of regular riding improves your cardio.