randytsuch

My boards came over the weekend, thanks for doing this.

If you would not have posted about it, I'd have never known the PS board was supposed to be thicker. So no problem for me either. A little board like that will be plenty stiff at 062

paid Thanks for doing this

Please add 2 GRHVxxx bare boards to my order, in addition to the 2 assembled boards already there. Thanks Randy

Way overdue update on my 45 based DHT headamp. In breadboard state, was really quiet. After I boxed it up, as shown in the pic I posted way back, I had 60 hz humming. It was pretty bad on my hd800's. Spent a long time trying different things, because quiet a bit of the wiring changed when I moved into the chassis. It turned out that what finally resolved the problem is that I had added a CLC filter on my ac in line. The filter and ac lines were under the output tx's. Should have been obvious in hindsight. Removed the filter, ran AC directly from IEC jack to power tx, and noise is almost gone. There is still a real small amount of hum I can hear if no music is playing, but you have to listen for it. I am using the low impedance output tap from my output tx's. So in summary, I was able to make a one box dht amp using 45's and the Tubelabs SE pwb that is quiet enough (although I can't call it dead silent). Sounds really good (IMHO). Randy

I always weigh beans for each shot, and then time the shot. I aim for about 30 secs from when I push the button, so for pre infusion maybe a bit longer. Bought a little cheap gram scale just for weighing shots, and made a little arduino to measure grouphead temps, and I added a shot timer function to the arduino. So in daily use its pretty easy for my morning latte. For bean storage, I think I said this already, but I vacuum pack in about 1/2 lb per and freeze my beans to keep them fairly fresh. I buy 5 lbs at a time, and it takes a few months to go through it.

Anyone still have boards? Decided I'd like to give this a try if I can get my hands on the boards. Randy

In case anyone still cares about coffee storage, I buy a 5 pound bag from redbird, then separate into bags of about 1/2 pound each. Then I vacuum pack and freeze the bags. Pull them out as needed, let come to room temp, open and enjoy. I either pull one shot or make a cup of drip on most mornings, so it takes me a while to go through 5 lbs. Not as good as freshly roasted, but still pretty good. Once in a while a bag will lose its seal so I pull that one out first, but most stay sealed until I'm ready to use them. Randy

Just looking at the circuit, I find it hard to believe the actual values are that critical. My hunch is since its balanced, they really want sets of resistors to be close. For instance, I could see how R1-R4 should all be close to each other, but I don't think it would be critical they are all close to 750 ohms. And in the end, the op amps may be what limits performance, not the resistors, but that is also just a hunch. But because I'm anal, I will usually buy extra resistors and hand match, unless I'm using expensive exotic resistors. Randy

FWIW, Allo used the Sparkos discrete op amp design in their Kantana Dac. From following really long Allo thread at diyaudio for a while https://www.diyaudio.com/forums/vendor-s-bazaar/294940-fifo-buffer-rpi-sbcs.html it seems that Allo does a lot of work on their designs, so I expect they tried a lot of options before picking the Sparkos. I also think I've seen good things about their voltage regs, but never tried them myself.

If you're in the US https://www.amazon.com/?Jonerytime?Stainless-Deburring-External-Chamfer-Remove/dp/B07JR9QPBH/ref=asc_df_B07JR9QPBH/?tag=hyprod-20&linkCode=df0&hvadid=312003160272&hvpos=1o1&hvnetw=g&hvrand=12990877068024208839&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030970&hvtargid=pla-571685233097&psc=1 Reviews are mixed, but it is cheap enough to try.

I ordered from Massdrop a little while ago, and it arrived earlier this week. Fired it up last night, and right out of the box sounds pretty good. Letting it burn in now, will see how it sounds tonight. My initial thought is for a set of cans and amp, its a bargain at the massdrop price. My long term plan is to build an amp for it, which hopefully I'll be able to get done one of these days. Randy

Thanks. I did take this on later in life, so although a first big wood project I have lots of experience building stuff. I have a scrap piece of paduk, and am thinking of trying to make a volume knob with it. Hopefully I can make something nice looking.

Thanks I'm really happy with the final result, but it took MANY MANY hours to get there. My first big woodworking project, so I had to learn as I went. For both the maple and the leapardwood, I took small pieces of wood and tried a few different finishes, to see which finish came out best. Did a lot of research online on finishing maple when I was working on the main body.

My chassis is almost done now, finally. Took a quick pic this morning, lighting not good, but will give you an idea. The front accent pieces cover a drilling mistake lol. I tried to add a pic of the top, but I think I reached my size limits for uploading pics maybe?