luvdunhill

looks like this can scale up via adjustable bias and the psu... in this case, you can never can have too much aluminum

All this is totally up for discussion. My preference would be heat sinks that are totally external to the case. The heat sinks I got from Conrad are absolutely beautiful and the rabbited edge and pre-tapped holes make things very easy to assemble. There is the possibility that more of these would be made available, in which case this would be my recommendation. We could also interface directly with Conrad or R-Theta, both of which I've used in the past for things. Total cost to my door (as part of a large GB) was ~$100 a pair for the largest profile from Conrad. I'll post pics (some are in the n_maher beta24 thread) I suppose we need to run some numbers on the output device heat dissipation.

I'll post silk pics tonite. I'd recommend 1 sigma22 per pair of boards. I was thinking "by build" to mean just stuffing the PCBs, as well as some other task, like matching devices and/or helping with procurement of various aspects of the build. We need to consider casing as well, but I'd recommend a one size fits all casing option. I already have some ideas for this. Mounting holes would indeed be the same as Dynahi boards, but I'm only entertaining the off board heat sink layout (see post #1).

If it's from Thom, it's possibly the MintLP as he really pimps those. There was a point where he was handing them out for free, so he has the ability to produce them definitely.

Al, as someone who obsesses about cartridge alignment, I'd recommend the relatively cheap investment of an arc protractor. While the Wally Tractor might be the bees-knees, I'd go with either the MintLP or even the cheaper one made by KWILLIS on Audio Asylum. These options run the gamut in terms of price, but the KWILLIS is around $50 I believe. The nice thing is they are optimized for your arm / cartridge combination. The improvement of a properly aligned cartridge is quite simply work the added effort. enjoy!

ah the 6-channel "nomenclature". I think you really want 4. But, yeah that's the idea. It would look like: luvdunhill - 8 - 4 Asr - 0 - 4

I suppose you could recess the switch in the front as well. I'll let you decide Here's hoping the wood shows up today!

If you have to ask, this probably isn't the project for you I have no desire to calculate the rough cost honestly. Obviously things will be done in mass in order to keep the cost down, but the idea is to get things done in parallel and when possible just build them all identical with maybe one or two options. That's my vision at least.

that's the idea here. Again, no real time frame and I'll have to work out some sort of compensation for the "builders" that's agreeable. Just add your name to the list.

I think so to. Plus it's going to be awesome to get some of these in circulation at meets and what not

ok, so next step is to estimate the number of channels that will be built so I can get enough parts for everyone. Also, if you are a DIYer, indicate how many channels you'd be willing to build. I think we can accommodate everyone in this thread, including the non-DIYers. Just quote the following list and add your info: name - # channels willing/able to build - # channels wanted to have and hold luvdunhill - 8 - 4

according to the docs max panel is 11mm. or 0.4331" or 7/16" or 6.83554293

I bought the perforated aluminum from onlinemetals. I'm very happy with it! yeah, about 3/16". 4mm to be exact. The recess is 12" x 4.875" wide. I dropped the wood in the mail this morning and pickup was at noon, so I'm guessing you'll see it tomorrow. Also, remember the back of the wood will be right up against some hot heat sinks .. would it be best so space it out a tiny bit so it's not touching?

I'm thinking about finding a bunch of 2SK1530/2SJ201 pairs. If you have a good source, I'd love to hear about it

Told you this DannyB guy was a spammer.... nobody listened to me...

Looks like we need a "How are you feeling today" thread

yeah, we had a similar experience with our youngest recently. Came down the croup and we tried to hold off as long as possible without giving steroids to the little one... but off and on three nights in the bathroom with the shower steam kinda gets old ... not exactly С лёгким паром!

yes. One for case the wall warts and the other case will have an Altoids tin can strapped to the bottom with cable ties with Black Gates on the outputs.

until you realize she's allergic that can be exciting.

I think we know where this is going next... *definitely* needs to visit the Dr. for a special treatment!

I think I may have a schematic somewhere.. I'll check tonite.

huh? no, definitely wire edm.

I haven't found a place that will do custom extrusions for less than a 1 ton order. I have a feeling that EDM is more accurate than laser cut, as it goes down to ~5um tolerances. Perhaps not needed here, but certainly doesn't hurt. I don't see any reason Kevin you should have to pay for them if this deal gets off the ground, the only issue is the fact that I have limited quantities Of course, a modified Dynafet board would be super cool, but it seems like it would be too hard to do... Specs attached just in case though!

Yes, via edm. Wire cut aluminum then anodized with appropriate tolerances to leave 0.1mm gap for silver epoxy. One side is missing fins so two can be coupled together for a complementary quad / differential input pair (my use would be BT clone). Handy huh? 0.1mm wasn't chosen at random. Thinner than that adhesion is lost, thicker and there is higher thermal resistance. Another interesting point is you can run V grade devices at full dissipation without any drift. Yeah Kevin, I had a problem with this and that circuit I showed you.

So, gathering interest for collaboration on KG's Dynafet. The way this would work is quite simple. There would be a group buy on parts as well as the boards. The parts would be supplied by myself and we'd work a deal out for people contributing in the matching efforts and various aspects of specing and acquiring parts. The boards would be the Hitachi version with external heat sinks, using KG's latest board files. Front end would be constructed from devices matched from a pool of 500 2SJ74BL and 500 2SK170BL matched to 20uA accuracy. All devices were pulled from original Toshiba packaging. Actually matched to 10uA with +/- 20uA measurement uncertainty added on top. The will be bonded together using couplers made on a CNC wire-cut machine. See attachment. I think the performance will exceed the single substrate versions due to the better matching characteristics. I also have 50 pairs of 2SJ79/2SK216 that will be need to be matched as well. These sell for around $10 a pair these days. Mine are all from the same batch code purchased in original Renesas packaging. I'm thinking there would be an upfront deposit of $75 per stereo set ($150 balanced) for the devices and matching efforts and a similar arrangement (probably $40 stereo and $80 balanced) for boards. Group buy participation is requisite on some member here "vouching" for you as well as an agreement that this isn't going to happen overnight and there is a lot of work that needs to be done to do this right. Everyone will have some sort of job to do, as this is really a group effort. So, anyone interested?