chiguy Posted July 20, 2015 Report Posted July 20, 2015 Thanks! Just wanted to note that on the V5 board there are 2 unmarked caps, one in the lower left corner by the LV terminal block connections and another to the right of the balance trimpot and 1K resistor. 1
chiguy Posted July 20, 2015 Report Posted July 20, 2015 (edited) Ah yes... What would be an appropriate wattage rating on the 12V diode by the offset? I suppose this is the insulating pad to use for the SIC fets: http://www.mouser.com/ProductDetail/Aavid-Thermalloy/4180G/?qs=sGAEpiMZZMsiS1%252bJOF5Pn3Y9BV2SYj6ta2DYsATGOnI%3d Which insulating washer should we use? Edited July 20, 2015 by chiguy
sorenb Posted July 20, 2015 Report Posted July 20, 2015 (edited) Ah yes... What would be an appropriate wattage rating on the 12V diode by the offset? I suppose this is the insulating pad to use for the SIC fets: http://www.mouser.com/ProductDetail/Aavid-Thermalloy/4180G/?qs=sGAEpiMZZMsiS1%252bJOF5Pn3Y9BV2SYj6ta2DYsATGOnI%3d Which insulating washer should we use? maybe this is what you're looking for: http://www.aavid.com/product-group/accessories/washers ...though I don't think you can find washers > 5,5mm height the crees are almost 5,5mm thick ... I used plastic screws and the aluminum oxide pad As for the diode, I believe I used this http://dk.mouser.com/ProductDetail/Fairchild-Semiconductor/1N914/?qs=sGAEpiMZZMtoHjESLttvkik5r7Tz9frEDfTvpuQlhm0%3d Edited July 20, 2015 by sorenb
bellhead Posted July 21, 2015 Report Posted July 21, 2015 Any thumbs up/down/sideways or other uncensored comments on the KGSSHV-Mini (Mjolnir) I'm getting to feed my 009? It's a used one from a few years back I think, the one w/ about a foot-square footprint (that's ~ .31 meters square for those who think metric), 400V I'm told. 'finally giving up on the 007t2 amp. Thx.
sorenb Posted July 22, 2015 Report Posted July 22, 2015 (edited) Any thumbs up/down/sideways or other uncensored comments on the KGSSHV-Mini (Mjolnir) I'm getting to feed my 009? It's a used one from a few years back I think, the one w/ about a foot-square footprint (that's ~ .31 meters square for those who think metric), 400V I'm told. 'finally giving up on the 007t2 amp. Thx. The Mjolnir KGSSHV-Mini is a pretty fine amp - not a full blown KGSSHV, simpler PSU and a bit lower voltage swing but more current as you have been told ... I guess it also depends on how old/new you 009s are ....the early one I have heard sounded artificial ....there has been postings on the newer 009s being better though Have you been searching Head-Fi? there might be loads of comments in this regard Edited July 22, 2015 by sorenb
bellhead Posted July 22, 2015 Report Posted July 22, 2015 Thanks for that. My 009 is sz9-15xx that I got 3 yrs ago directly from Stax. I don't know what to make of this bass-heavy 009 talk. But FWIW, artificial is the last adjective I would apply to my 009. I hear some amazing Real-ness that I did not hear with my previous SR007 mark 1s or my Lambda Novas many years back. When everything falls into place, my 009 is sweet with the fastest bass on earth.
bellhead Posted July 24, 2015 Report Posted July 24, 2015 Yep, got the KG HV mini. Great amp; tames the 009 into much less of a wild animal. Listened for hours of fun + excitement w/minimal cringing. For some reason, 'sounds better with the SE inputs on this early model, less shrieky, and every little bit of Quaaludes or Serotinin helps the 009, as long as you don't mess with the tight bass. Nice work Spritzer- big thanks for this creation. 1
leonjo Posted July 28, 2015 Report Posted July 28, 2015 Hi everyone. I'm going to order the transformer for the kgsshv carbon. So the output of the transform will be 360V @200mA x2 and 15V-0-15V @500mA is it correct？ Thanks a lot.
Kerry Posted July 28, 2015 Report Posted July 28, 2015 I'd probably go to 350mA for each of the hv windings.
sorenb Posted July 28, 2015 Report Posted July 28, 2015 I'd probably go to 350mA for each of the hv windings. Please share your calculation behind that recommandation ...
Kerry Posted July 28, 2015 Report Posted July 28, 2015 I was thinking of about 20mA per leg with 4 legs for both channels. There is some additional current required on the negative rail, I forgot how much, but I used 22mA x 4 = 88mA per rail. I then multiplied by 4 which is a reasonable factor for power requirements on the transformer. Some would suggest 5x. So 88mA x 4 = 352mA which would give approximately a 250VA rating (not counting the LV of about 18VA). For the Blue Hawaii I use 350VA transformers and sometimes more.
gepardcv Posted July 28, 2015 Report Posted July 28, 2015 The 360VAC primaries under discussion are for the 450V version, right?
gepardcv Posted July 28, 2015 Report Posted July 28, 2015 Thanks. I've been thinking about whether I want to use a 400 or 450V PSU for my Carbon build, and honestly don't know. Not sure how much output current to go for, either. Given the height of the caps, I'll probably use a 3U Dissipante case (the 300mm deep version, though, not the 400), so plenty of heatsink area. Any guidelines or suggestions on the tradeoffs? I will primarily use a 007A (the recent "Mk2.9"), and I don't listen very loud.
insanity Posted July 28, 2015 Report Posted July 28, 2015 I would also really appreciate it if we could get and "official" recommendation on the transformer specs and current.
spritzer Posted July 28, 2015 Report Posted July 28, 2015 There is no way to do that and be sure that the transformer won't buzz or misbehave.
insanity Posted July 28, 2015 Report Posted July 28, 2015 Could you elaborate on that spritzer? I guess you have the most experience here with building these amps so far. What transformer specs do you use then? Do they misbehave? With the conventional KGSSHV and KGST there have also been some recommendations on what transformer specs to use. And I haven't had the slightest problem so far. How is the Carbon different?
sorenb Posted July 28, 2015 Report Posted July 28, 2015 I was thinking of about 20mA per leg with 4 legs for both channels. There is some additional current required on the negative rail, I forgot how much, but I used 22mA x 4 = 88mA per rail. I then multiplied by 4 which is a reasonable factor for power requirements on the transformer. Some would suggest 5x. So 88mA x 4 = 352mA which would give approximately a 250VA rating (not counting the LV of about 18VA). For the Blue Hawaii I use 350VA transformers and sometimes more. my own thinking in this rgrd was based on the recommandation for a 150VA for the KGSShv ...and since the Carbon pulls 4*16mA more I ended up at 200VA The Blue Hawaii is pulling a lot more I guess ....at least if you take the heathers into account? I guess it boils down to the "reasonable factor" for how much overhead you want ...
spritzer Posted July 28, 2015 Report Posted July 28, 2015 The Carbon isn't any different when it comes to transformers but it is just a massive crap shoot to source transformers. Half of my Toroidy units buzz but the other half don't, some even don't work flat out so they clearly aren't testing. This is from a good supplier so imagine the bad ones. The ones I'm using in the Carbon are 335V/200mA but they were extensively tested and I went through three samples just to make sure they were ok. Also no singles here, you need to spend 2k$ on a single order or they won't talk to you. I had some R-cores come in recently that will have to be tested too.
sorenb Posted July 28, 2015 Report Posted July 28, 2015 some even don't work flat out .... as in they don't work at all??
spritzer Posted July 28, 2015 Report Posted July 28, 2015 Some don't and some just have a winding that is way off.
insanity Posted July 29, 2015 Report Posted July 29, 2015 I am quite surprised of you experience with toroidy too. Of course you have ordered way more transformer so far than I ever will, but the ones I got from toroidy were perfect. I was going to order one from toroidy for the carbon too, but now I am not so sure about that anymore...
JoaMat Posted July 29, 2015 Report Posted July 29, 2015 (edited) / Edited November 11, 2015 by JoaMat
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