Leaderboard

Bolted a slightly different one of these (than I just sold) together 😅 I need to revise my little autoswitcher board to make sure the negative input is grounded when the RCA is input is chosen - a difference between the two boards. Also, interesting way to hide the front panel screws, note the two small set screws I just measured them and they perform as stated. Will try and listen to them this weekend and then back on the bench to get the inputswitcher working...

The "SRX Plus" is what Jim (JimL) named the circuit he modified based on the SRX schematic which I believe Stax released to the public decades ago. The modification, among other things, adds CCS to some critical positions which significantly improves on the performance of the original circuit. I don't believe Stax ever produce an amp based on the SRX circuit. I built one and I love it!

Have you seen my hands? It's nice that you keep all the woodworking tools in one area. That'll make it easier for me to back a U-Haul truck and load it up quickly, when you move onto a new hobby in a few months.

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 also the solid state relay in the HV delay section is obsolete and I replaced the footprint with a standard relay.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.

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Ice Ice baby. Way cooler than my box 😂

I have been waiting for Jeff to start wine collecting and Japanese chef knife collecting but so far nothing... 😔

I am Voltron, and I approve of this message.

Where’s the smashed wood?

Tea and freshly baked ... https://www.halfbakedharvest.com/tahini-butter-chocolate-chip-cookies/

I think there are enough of us with turntables to warrant a specific vinyl thread. After all it's not the same as streaming digital. Shirley Bassey: Good, Bad but Beautiful

Opus X Forbidden 13. Truly excellent.

Just a bit more, at around 1 kW per box into 4 ohms...

Paging DOTU:

Don't feel too bad. Most straight guys are a bit tentative at holding nuts.

Maybe he had a TICE?

Another one from Tommy. "My wife tells me one day 'I think you love baseball more than me.' I say 'Well, I guess that's true, but hey, I love you more than football or hockey.'"

Not a big baseball guy, but I Lasorda liked him. RIP Tommy

Just a generic clip-on desk light from The Evil Empire. I did not realize when I purchased it that it is touch sensitive to turn on and cycle through the brightness settings, which is really handy. I modified it to be able to work with my slab platform as the clip that it has does not open wide enough (Joke setup was unintended).

Sleeping Jax. Hard to believe he’s 10 now!

Not someone I personally like but he was a big figure in baseball and a hated figure in my house full of Giants fans. RIP Tommy. The Dodgers suck!

Nice little turntable platform

# special boxlympics

RIP to an actual patriot.

Getting some culture...

RTJ hands fixed Honestly, I'm pretty psyched with how these came out and they were a great test bed for figuring out how to accurately combine/sequence engraving and cutting. Now for a light sanding and finishing and then delivery to their owner.

Last night:

Three blind mice jazz!

Lacy

Nelson & Milsap

Nelson & Russell

Yas. newvelle volume 1 jazz comp

So here's a progress update on my T2 mini build. I started off with the a golden reference version of the T2 supply. Had a couple of issues. There was some 60Hz noise I was hearing (I'm guessing from the integration of the negative rail supplies), which I can probably solve for. Also, the current limiting, which works, wasn't fast enough when there was a shorting issue with the amp on the negative rail (FETs in the output section shorted to the heat sinks). It would pretty much blow out several components in the supply. I decided to go back to the original design, but as a shrunken version (206mm x 200mm). I did some small mods (added cascaded current source for the 30V supply to the opamp and added some additional spots for compensation caps. I finished this over the weekend and have spent some time listening. I've still got to tweak the PS (some small oscillations - probably because I was experimenting with the .1uF cap to the negative input of the op amp and added a .1uF cap across the voltage divider). My BK multi-meter is showing between 1mV and 0 on the AC setting. I've had some of the supplies on the scope but will need to go through all of them. This causes some very faint background noise. The amp has had it's fair share of issues, primarily with the output FETs shorting to the heat sink. I've had this once on the left channel and three times on the right. I believe it was that some thermal compound found it's way inside the collar of the thermal washers (7721-3PPS). I've cleaned these up and have had the amp on for 12 hours now with no issues. Also, the right channel DC test points are all pretty much spot on, but the left channel has an issue with the -543V test point. It is sitting at -502V (the rest of the DC test points are pretty close except for the top of the batteries that sit at +238V). I've been looking at this issue for a while, but haven't figured it out yet. I've got to focus here a bit. Any thoughts would be appreciated. I also have to finesse the battery adjustments to get rid of some occasional noise coming through the right channel as well. I have had my 404's and then later O2's on this beast. Wow, how nice It's been too long...

Got the boards back and finished stuffing most of it. Here's some pics (forgive the phone pics and bad lighting).

This one hurts, though he’s discussed this day often. Michael Apted, 1941-2021, ‘visionary’ director of Up series dies. https://www.theguardian.com/film/2021/jan/09/michael-apted-1941-2021-tributes-paid-to-visionary-director-of-up-series?CMP=Share_iOSApp_Other

I never thought I'd post in this thread, but climate change changes things. It's been snowing for 3 days and temperatures are rather low, so we have Madrid, an absolutely unprepared city, covered by snow layer of about 3ft. The problems are that they don't have the machines to remove the snow from the main roads, streets and avenues, nor can spread salt to avoid ice formation. I'm expecting absolute caos and confinement for about 2 weeks considering the temperatures forecast for the next week, most days below 0ºC (32ºF). I'm fearing food shortage. Not even my 83 years old aunt has ever seen such snowing

RIP Marion Ramsey of Police Academy fame. She was 73.

RIP Neil Sheehan, reporter and Pulitzer Prize-winning author who broke the story of the Pentagon Papers for The New York Times https://apnews.com/article/neil-sheehan-dead-af7893e6608a0eb2417ccf3f460179f1

RIP, Alto Reed, sax player for the Silver Bullet Band. Boy, if you don't feel the chills when he kicks in here... well, it sure gets me every time.

Thanks guys... I buried her under the tree just outside the window she liked to stare out of. Gonna have to get used to not having my shadow following me around the house anymore.