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Yesterday we were in a aerial festival here. It's the Patrulla águila.

Decided to find some motivation this morning.

World Series or unusually late Apple Event tonight? apple.mp4

Another Wes Anderson inspired breakfast photo.

That is so truly awful. On many levels.

LED: The numbers are all over the place: Your IV curve shows the LTL4213 should have Vf between 1.725V and 1.750V with 0.5mA of current. You've got three different voltage ranges for the LED. Which one is correct? You need to find out where the dependencies come from. Your previous LED chain voltage measurement shows 12.1-10.7=1.4V of voltage variations with not much If change. Is the 1.4V evenly distributed across 7 LEDs? If you suspect Vf change due to the temperature coefficient, that's easy to verify. Just keep monitoring the LED voltage with the amp powered on from cold. 2SK246: Your test indicates that the 'backup ones from ebay' are probably good. Unless the ones on the board are from the same seller and same batch, the test result probably doesn't help much more than that. Rather than replacing parts shotgun style. I'd take voltage measurements shotgun style, then sit down and analyze the data. Replacing parts without knowing why and what would be a very inefficient way of troubleshooting. For example, when looking into the active battery, measure voltage on all nodes. Beware of the burden by the DMM input impedance (usually 10M Ohms but YMMV), so plan carefully when you measure across high-value resistors. When looking into the final stage, collect enough voltage data within the CCS so you can calculate the current supplied by the CCS. Measure the voltage at Output+/Output-, then determine if the tubes are in the right operating point. If you know very well how the circuit works, you can strategically take only a few measurement at key spots; otherwise just do more leg work and collect all data. Don't worry if some could be redundant. They often end up helping you where least expected.

Based on the recent @mikeymad Casual Jazz/Gleason post in the music thread.

All Christmas all week here as the orders are piling up.

It's a quesadilla night.

hi! i settled down with standard dn2540 current source (bit higher current) and two HLMP-6000 low noise red leds which gives a 3,1V reference voltage. led thermal drift is not a problem in my case. how does led noise compare to voltage re ference ic-s (LT1021 for example)? as always any answer or critic is appreciated! btw this is the best sounding thing i have tried with my power supply so far

Well, because OnSemi are a bunch of fuckwits who seem to have forgotten how to make semiconductors Example from Mouser for the MJW21193 308 Expected 23-Aug-24 1,020 Expected 03-Mar-25 Farnell reckons 33 weeks, which is consistent with Mouser. FFS! Same with the high current version with TO3 power transistors. MJ15023 no problem but MJ15024 1,997 Expected 19-Mar-24 2,200 Expected 24-Jun-24