luvdunhill

yup, those are the correct boards. well, if we did want to rework the boards, I'd love to see the JFET comp. pairs back-to-back, as referenced at the start of this thread.

yup, this is the idea and what the heat sinks referenced in this thread bring to the table. I've talked to the manu. and he is willing to do another run. If we're talking about 50 boards, then this comes to 200 heat sinks. I need to work out cost with him, as this run would be smaller than the previous. Also, the cost for the matched JFETs won't be insignificant. 1000 of each type N and P was not a insignificant investment (look at pricing at B&D for example), plus the average of 3 minutes per device to match (including calibrating the test jig every 10 devices). This plus the heat sinks and you're not really looking at much of a "savings" over the traditional 7-zip packages. However, still cheaper than unobtanium. Then there are the MOSFETs.... I'll work on that today.

heh.. I was curious what you'd guys would say to that. Anyways, Pars and I will work offline to come up with part cost. Stay tuned.

Maybe $1250-$1500 for 4-channel build? I think we need to work a BOM based on the above quantities and go from there. I will try and get some hard quotes on semiconductors tomorrow. Perhaps Pars can take a crack at the various and sundry other items. DigiPete: What did your Dynamight build cost? I'd say an extra 20% on top of that.

I'm going to tentatively draw the line at the following: 10 amp chassis 42 part kits 50 boards Time to check the part bin.... er storage closet edit: can someone please check my math / read back through the thread and see if this sounds okay?

I'm curious what the C/W rating is of the heat sinks are though. Looks like we're talking around 3.75W per device...

I'd say let's get a quote for those cases.

If you happen to have a list of current requirements for all headphones minus a K-1000 I can try and answer that one for you ... otherwise, remember, there is no such thing as overkill in this hobby, especially in a Kevin Gilmore design

good question. Better find an appropriate floor wart for interested builders quick!

I'd say they compare favorably to commercial amps in the $5K range.

pshaw.. no one is actually going to listen to these, they are just for show

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everything is through-hole

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