nopants
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Everything posted by nopants
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wow Kerry your hand work is excellent, sell your proto work to fund more projects
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http://m.newegg.com/Product/index?sdtid=7960029&SID=200bce73e9dd4f99a113675bc07f3c04&AID=10440897&PID=1225267&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-cables-_-na-_-na&itemnumber=9SIA29P2NU2848 hd700 + 50 usd newegg credit for 500 usd
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navships on ebay has some wired that was contracted for the Trident Missile program, that stuff is really nice to work with. a bit stiff but it depends on what you're looking for I guess. I think it's a kapton wrap
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it sounds like its only a matter of what offset value with which you yourself are willing to be comfortable. I don't see how this offset would affect the sonic performance in any significant way
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I can go ahead and try to use the insulators that were attached to the end bells. I don't get clearance for the schaffner inlet then (what I had on hand). That's why I only drilled out a light hole on the front. I do want to put the transformer closer to a supporting foot though...
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that was also part of my reasoning for using a preamp... something with a remote so I can listen comfortably behind the blast shield -
to bring it back around to the regular hv...I had the boards and case lying around and I was able to find a new faceplate by itself- for some reason it took me forever to figure out how to case all these into the galaxy box... how do I bolt down the edcor? hard to use the existing end bell holes without messing up the wires I tore up my hand trying to punch an xlr in the back plate though... maybe I just need to resign to getting them machined now. are you supposed to clear the entire punch bolt with your hole or just the threaded part? I wasn't sure how to ensure the most centered punch hole.
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do you like them out of your carbon? Did you do anything special like goop in order to foolproof some of the implementation shortcomings? I've always been interested but they're so damn elusive. I feel like a dumbass for not having picked up j-pak's pair. Maybe if I'm able to offload some amps and your pair isn't sold yet I'll pull the trigger.
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you're selling your omegas birgir? I remember years ago I read something about how the omegas are prone to head/reliability issues. Is this a factor still? Can we hook these up to all the modern amplifiers without them melting down on us?
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if you don't think that mounting the caps horizontally will be a problem then leave it
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Squeezebox Alternative or Chasing the Pegacorn
nopants replied to n_maher's topic in Home Source Components
I've heard that their spdif implementation is a schlep but I guess jocko homo would say that about every implementation -
oh I'm not enforcing anything I just wanted to say bum
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ok that's good to hear, maybe it'll be worthwhile to bracket one of the circolotron driver/output/psu so it doesn't occupy a ridiculous amount of space in two dimensions I should start looking at eBay for used forklifts so I can tote the circlotron to all those meets
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Closed - KGSSHV Carbon and GoldenReference HV PS Group Buy
nopants replied to mwl168's topic in Do It Yourself
it might be less of a hassle for you to open the sheet to the public and let us edit the quantities? -
If you are confident about the shrinking (I'm already convinced haha) then I guess it's a question of how much sinking is really required.... btw have you had any issues with bracketing the output SiCs on the carbon? After reading the F5X article I was wondering if it is worth the effort to to clamp the devices to the sink, as opposed to just using a single screw/washer/etc. After cobbling together the Megatron I can't imagine having to do it "professionally", let alone this beast. The more I think about this amplifier the more I'm becoming part of team stax power amp. What knob could possibly do a circlotron justice
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Megatron Electrostatic Headphone Amplifier
nopants replied to kevin gilmore's topic in Do It Yourself
sorry for the spam, but the coupling shafts just came in. I'm aesthetically finished, just waiting on a mains relay now. I've been using it without a delay like normal but I imagine it would unnerve anyone else who used it... feels good man. this thing took forever because I was too busy listening to it the aspects didn't turn out exactly how I wanted but I met the space/density goals. it kind of reminds me of a Manley amp with the way the tubes are oriented, except nicer boards overall I'd give it a 3/10 because the knob isn't made of obsidian I think I'm going to get someone to take real pictures of the thing before posting ad pics on head-fi -------------------------------------- Other bits of information It gets pretty warm inside the case. I think the top plate gets to ~55C after 8 hours or so. Underside isn't a problem, top plate worries me a bit but it doesn't seem to be hurting anything. I switched out the quads, CCS tubes are on the outside iirc so orient your quads that way if you're mix and matching I might be a fan of Supremes now, I'd shake my first at Birgir if it wasn't dead from screwing and unscrewing things -
ok got it, I was spacing out in board layout land so one "standard" fqp hv supply can just go over the transformers if the driver board doesn't need more current than that
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As in you need 2 of your currently pictured floating supply boards, right? 2 900V outputs per board? Splitting the boards would make things nice and symmetric if you position the boards on each side of the output board. Also footnote for stupid people like me, but opt for 3 oz cu if you're going to fab the boards
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a good candidate for the nfb preamp in front, less 5u face plate clutter haha If you are willing to emulate the F5X layout you should be able to open up a significant amount of heatsink area if you're planning on mounting the PSU's vertically by offboarding the caps (need to check x dimensions). then it can be something like [insert sink layout here later] mounted on the sink, assuming the output board spits out the most heat? based on the floor space/clearance maybe some of these can be turned horizontal via brackets, like either the driver or the output, depending on which of these needs more sink area. transformers on the bottom, not sure where to put the fat PSUs if you need 2 of them... For reference: http://www.diyaudio.com/store/amplifier-chassis/deluxe-amplifier-chassis-enclosure-5u-217.html Width: 450mm with 360mm usable internal space (14.1") Depth: 400mm (15.748") Height: 210mm (8.26")
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Don't know how else to organize this ATM... Some items: Marc suggested using DC Link? capacitors in the floating supplies- I'm not 100% sure about each of the appropriate pieces that compose the entire amplifier, but the first image that formed in my mind the F5X enclosure described here. Transformers on the bottom, amplifier + output psu on the sides, standard psu on the back/over the transformers. Seems like something to leverage here would be the way EUVL chose to mount the capacitors...maybe another set of daughter boards? Allows more options for aspect ratio, and you're not subjecting these honking capacitors to as much gravity- I will try to be productive and see how the actual measurements stack up. One bonus of using "standard" enclosures is that we also have access to riser panels which seem to be made with the larger cases in mind, There is also the possiblity of standardizing the I/O, faceplates, board mounting holes blah blah blah
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Hope you guys don't mind, but I'm taking the liberty to collect some info, links etc. here. 900V floating supplies 350V/us the cole slew (couldn't resist) seems to be happening in bits and pieces in multiple threads on multiple forums and there are some implementation issues which seem to be worth discussing...namely fitting all of this somewhat daunting amplifier into one case. I guess at some point Kevin decided to split the input and output stages- output board output schematic The output stage features the floating supply floating supply fboard floating supply schematic the input/driver board As of today the aim is to fit this all in a single modushop 5U chassis, the floating supplies make it prohibitive to split the build across multiple boxes. Transformer Specs: Supposedly trivial to get an EL34 version of this working but SiC version will be first Just wanted to hopefully direct discussion here instead of dragging it across the kgsshv/GB/headfi threads. I'll update this when I get around to fishing around for the appropriate information. Thanks to Kevin for making the design process somewhat transparent ---------------------------------------------------------------------- Figured I'd put this here too, since Kerry speaks for all of us:
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He probably got triggered by all the headphone name dropping. At least that's what caught my eye first, and I've listened to a Shunyata nordost power-cabled airbow k5000 inserted into my bum so I know what I'm talking about
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Closed - KGSSHV Carbon and GoldenReference HV PS Group Buy
nopants replied to mwl168's topic in Do It Yourself
I think Mike should clarify (sooner rather than later) what he does and doesn't want to offer...I'm too lazy to keep track of all the forks at this point. You seem to have gotten like 2 unique versions of the supplies for use in your own case? Based on what's in his sheet as of today, I'll change/fix my entry to: 4x V3 amp boards 2x dual psu (1 set) 1x single fat PS 1x single skinny PS and similar to Kerry I'll pencil in interest for the Golden Reference LV. -
Closed - KGSSHV Carbon and GoldenReference HV PS Group Buy
nopants replied to mwl168's topic in Do It Yourself
a bit hard to piece together with mental images. if you're still committed to the 5u case, there's the option of using their riser plates in order to get some inner surface area, in the spirit of mitochondrial walls erector sets:
