Leaderboard

The doctor gave me his OK two months ago so I'm finally recovered ... I haven't been able to train much so tomorrow I just want to finish and have a good time in the middle of the peloton with my friends and coleagues.

Meanwhile, the latest initiative to solve the trucker crisis:

Esperanza Spalding’s Songwriters Apothecary Lab

I assume the displays for PCs and laptops have enhanced anti-burn in tech that isn’t present in TVs. That being said, I’d check the warranty terms just to be sure.

All of my LGs have significant burn-in. The Sony OLEDs do not as of yet.

Some Dicks

History can be unkind to dicks.

Moar steel and a vapor barrier.

Everything at the Same Time Caroline Marie Brooks 2021 Simple tunes, but enjoyable:

Further along in converting the garage to a proper shop, they poured the concrete for the foundation wall today. I had to leave a mark while it was still wet...

I built a blue hawaii with golden reference HV supply and the simple voltage regulator based lv supply built into the golden reference hv board. Later I added a golden reference lv supply which improved the sound a bit. I also replaced the diode bridge on the LV with a synchronous rectifier for even lower noise. The blue hawaii is a very good amp. Far better than anything I had listened to previously and was a quite straightforward build I did not modify any of the gerber files. I did solder the leds, the resistors you need to measure the voltage across to set the constant anode current and the adjustment pots onto the top side of the board for easy checking and adjustment. I managed to fit everything into one 400mm deep disapante case The T2 build is by its nature almost twice the size of the blue hawaii and of course more expensive. The pcbs are bigger, there's more values and components and more power supply rails and multiple transformers etc. I also had to modify the gerbers to fit my build style, selected volume pot and the case I wanted to fit the amp into. The T2 is just magical and is my daily listening device. If you only have the time and resources to build one build the T2 and get the best to begin with. I don't regret building the blue hawaii but I have not listened to it since I built the T2. I found the T2 build to be big but not difficult. I read the forum posts carefully followed their advice and used xicon resistors and ultrasonically cleaned the pcbs. I also measured every component with a LCR meter and transistor tester etc before soldering them in and checked everything multiple times... I even tested the zeners and diodes and matched all components between channels and between + and - halves of a channel. I actually finished the pcbs about three weeks before I switched the amp on.. I got locked into a cycle of checking and rechecking everything and was convinced I would get sparking or noise batteries. So far I have had no issues at all with the amp and the initial fear I felt from reading the forum posts on failed T2 builds has dissipated. most importantly the T2 has 4 more glowing valves than the blue hawaii and so looks better in the dark... but then the megatron has even more valves

The Gerbers for my T2 build. My T2 has been working without issues for some months now with heavy usage almost every day so I feel reasonably confident about posting the gerbers I used. (see my previous build posts for more details and photos.). full credit goes to Kevin for the original design and joamat et al. for the modifications to modern components. I simply hacked up the gerbers to fit my build style. The amp gerbers are slight modifications of Joamats mostly modern T2 (his build uses all available components except for 4 of 2sj79 and 8 of 2sk216). My modifications include the addition of screw terminals for all voltages, shortening to fit into a hifi 2000 disapante 2U 400mm deep case, split into separate channels, removal of the pads for the pot, wider clearance between components and the ground plane, instructions on the top side for the adjustment pots. T2 left.zip T2 right.zip (note left and right are swappable I just like the 6922 valves at the front) The power supply is also based on Joamats T2 psu, with a couple of error corrections, there was a missing track and a couple of incorrectly labelled components. also the solid state relay in the HV delay section is obsolete and I replaced the footprint with a standard relay. minus and 250v cleaned .zip cleaned t2 hv and lv bias and delay.zip Feel free to use/modify/ignore. I do find that in the power supplies the 3W resistor close to the film cap and zener ladder gets very hot ~90C on the high voltage tails. I have therefore modified the power supply boards to make them slightly longer and provide more space around this resistor and put some holes in the pcb under it for better air flow. minus and 250v cleaned COMP -560v lengthened.zip cleaned t2 kgsshv hv and lv bias and delay comp lengthened.zip I have ordered a set of these lengthened boards but I have not received them yet or made a build using them so if you are going to use them please check them carefully in case I made a mistake. regards and good building James P.S. looks like next on the list will be a megatron build.