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The Very Best Of Jackson Browne

Dire Straits (1978) Matthew Sweet – In Reverse

Refreshed my Senn PX-200 with new ear and headband pads.

The tenth USA rider to win a stage at the Tour de France won on Sunday ten years after the last USA stage winner. Sepp Kuss, the Durango Kid had a great win in the Pyrenees!

100% pure vinyl

Blowin' The Blues Away Horace Silver 1959 Example:

I got your python!

It gets even weirder, that little board even knows how to speak python! Why a raspberry pi needs to talk to snakes, who knows.

Gerry Mulligan Meets Ben Webster

The Vanishing of Harry Pace: https://www.wnycstudios.org/podcasts/radiolab/projects/vanishing-harry-pace https://www.theguardian.com/tv-and-radio/2021/jul/14/an-american-riddle-the-black-music-trailblazer-who-died-white-harry-pace

Dropped Peter off for his two-week Outward Bound trip, returned our shitty rental car and now sitting in the Delta lounge awaiting our flight to Atlanta which leaves in a little under 12 hours. I like this lounge because they let you mix your own cocktails. If Delta goes out of business next week, you will know why.

I bet everybody knew this was coming but we've been moving fast and the board is taking shape. If it's not clear from the photo then this is a massive slab, 16" x 12", so quite a bit bigger then the production version. It will be built like the BHSE with the board mounted to the top of the chassis, with the tubes sticking out of the top and the components on the bottom. Massive heatsinks are needed to keep this beast cool and a single angle bracket is used on each side of the board to connect all the parts together and make assembly just a bit easier. To honor the Stax legacy the following will be printed on the board: "With the utmost respect and admiration for Dr. Takeshi Hayashi, a living legend". For those who don't know, Dr. Hayashi is the designer of the T2 and also the son of the Stax founder. Without his great vision and talents we wouldn't have the quality of phones/amps we have today. We will keep you updated as the project moves forward.

Ella Fitzgerald - Clap Hands, Here Comes Charlie!

^^ Been listening to that as well. Excellent as usual and sad all at the same time. The older I get the more embarrassed I am.

The maximum potential voltage there is only about 810v, so the 900v rating is perfectly fine.

You really want the highest Hfe for the batteries. I shoot for around 60

I am working on adding some walnut footers, which I almost assuredly mis-measured.

IMO, one of the greatest songwriters of our time.

Alan had a few early songs that I found annoying (Prop Me Up Beside the Jukebox, Itty Bitty), but most of his stuff hits home with me. I like my Country straight up, not watered-down.

I've redesigned my own boards and using the RK50 typically. I'm currently using C3675 (4x for the active batteries), KSA1156, C4685A (output CCS), FJPF2145, STN9360, J79, K216.

A bit of cart swapping to validate the arm board design. It has enough travel in the slots to work with the elusive DL-103PRO

Here's a new twist on my T2 build. I've added both the HE-90 jack as well as a custom built Teflon HE-60 jack with appropriate voltages/resistances. This one is in black chrome That's the back of the power supply...

Finished up the stairs!

I've done a lot of fine wood finishing but this is as extreme as I've ever seen (love to touch this finish!)

Well i finished my T2 build and it fired up first time and much to my delight with no smoke or flying parts. Have yet to put music thru but there appears to be no noise thru the amp with open inputs. With less than 100mv between + and - and 8v between outputs and ground i think i am a happy bunny. I am about to install V1 of Kevins Attenuator and was wondering about feeding this from a single 12v supply. I was considering taking the spare pin on the power sockets and picking up 12v from the power supply to feed the att. I will use the nano board to supply 5v and 3.3v. Is thisa good or bad idea?. Any other better suggestions.? Want to get this installed asap so i can listen to it. A long build but very satisfied.

Noise issue solved on the right channel I'd like to think I'm brilliant, but in this case purely dumb luck. I changed out one of the K216s coming out of the top of one of the batteries. I needed to do this because of the dumb part of my luck. I do love this power supply Just listening now in all of this the baby's full grandeur Still need to address the DC offset issue in the left channel and there seems to be some HF oscillation in both channels around 739KHz. @iwik I haven't gone through any final torqueing yet. My method is to drill out the transistors using a #26 drill bit and then deburr. This takes away any stress on the washers. I don't see why there would be an issue with bringing these to spec though. I bough a torqueing driver a while back. There are still a number of mechanical steps left on the amp. EDIT: Yes, I'm using the 3PPSG washers.

Thanks everyone. I really appreciate the comments. Yes, these are Conrad heat sinks. The PS uses 200mm x 75mm and the amp is using 350mm x 75mm. I'm seeing about 110 deg. F on the heat sinks at the hottest point of the amp. The amp and PS will be identical in size at 12" (W) x 14.27" (L) x 3.33" (H - not including feet).

I have installed a quad of Philips Herleen ECC88. Definitely sweet with xf2 EL34.

A detail that could help other builders : I had to deal with a hard to adjust channel. It crackled sometimes, with blinking LEDs. I was quite desperate, and started to read the batteries adjustment techniques again. First method was Inu's, 10k at the middle and 2k full to R32 side, not good. Then, I tried to adjust without using 2k, no crackling noise, but some random "whistles". KG's silkscreen patern, all trimpots centered, not good either. Finally Kerry's way cured the thing : 6.55V at 22k resistor using 10k pots while keeping 2k centered, then fine tune with 2k. So keep in mind that each build and each channel is unique. Be creative, walk sideways. Now the sound is scandalous, like I said... PS : 95 % Takman even in the batteries, not even raised above the PCB 750 Ohm at k216 gates 2*5pF compensation caps Matched 3675 at parallel spots Balanced and noiseless Sylvania "Green Hornets" 6922

I wanted to mention that a few folks have been having issues with the power supply not supplying enough current on the -500V rail. Seems like setting the 30 ohm resistors to 20 ohms helps. The behavior is that if just one channel (either side) is connected then everything works perfectly, but if you connect both sides, then the rail sags and it's impossible to adjust the batteries correctly. If you're not having the issue, there is no reason to do this. I'm not sure if the amp is drawing a bit more or the current sources are providing a bit less than needed. In other news, I just got my PS together. I need to mount transistors to heatsinks, which I'll be working on today. I did test the relay driver and found a small issue for the LED output, but it was easily solved. I've got it mounted in a jig so I can easily solder the remaining transistors from the bottom. Here's some shots EDIT: I just wanted to add that I love working with the SMD parts and heat gun. I'd say I can move about four times faster when stuffing components.