nopants Posted June 8, 2015 Report Share Posted June 8, 2015 I see one antek 360Vac for 50 a pop. Maybe it'd be a better fit for the el34 version though, since it has filament secondaries Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 8, 2015 Author Report Share Posted June 8, 2015 (edited) could also use this power supply for a DHT amp. and the parts cost is going to be up there, but not T2 levels. Edited June 8, 2015 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
nopants Posted June 8, 2015 Report Share Posted June 8, 2015 damn teasing a power supply for the mythical DHT amplifier? what were you going to do about the output transformer What HV rails would you get if you limited the cap ratings to only 450 or 500V? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 8, 2015 Author Report Share Posted June 8, 2015 direct drive electrostatic DHT output transformers, we don't need no stinkin output transformers as far as capacitors, how close do you want to push them? i feel that 90% of ratings is safe. so if you used 500v caps, the unreg would have to be 900V, making the regulated voltage 800V the original version of this power supply had 6 caps, 3 in series for input and 3 in series for the output. It would not fit in the box. Quote Link to comment Share on other sites More sharing options...
nopants Posted June 8, 2015 Report Share Posted June 8, 2015 the cost differential for 680uf 500V and 680uf 550V is ~28 usd according to a skim of mouser- http://www.mouser.com/ProductDetail/United-Chemi-Con/E92F501VND681MB65T/?qs=sGAEpiMZZMukHu%252bjC5l7YUXzhYIbW7AelNVPI8CA%2fgg%3d if there's no tangible performance difference between 800 and 900 reg out I would vote to go for the lower rails. Safety is also my main concern, as well as being a wussy I don't know about everyone else but I envision using the 5U case as a warmed seat, true luxury Quote Link to comment Share on other sites More sharing options...
JoaMat Posted June 8, 2015 Report Share Posted June 8, 2015 (edited) / Edited November 11, 2015 by JoaMat Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 8, 2015 Author Report Share Posted June 8, 2015 yeah, i know those caps are expensive. there is a much smaller version of the kgsshv power supply that uses them. that way you can get 450v. with single caps Quote Link to comment Share on other sites More sharing options...
nopants Posted June 8, 2015 Report Share Posted June 8, 2015 well I suppose my suggestion doesn't actually affect any of the boardwork, just part substitutions. It looks like you copied and pasted two sections together, might be cheaper to split the board in half? Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 8, 2015 Report Share Posted June 8, 2015 With a cyclotron, could you argue that the PSU caps are "in the signal path"? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 8, 2015 Author Report Share Posted June 8, 2015 (edited) the power supplies are in the signal path. the capacitor is just the storage device. no audio goes thru the cap, just around it. at least at audio frequencies Edited June 8, 2015 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 8, 2015 Report Share Posted June 8, 2015 Do you really need that much capacitance, if not what about using DC-Link capacitors? At least do the math from a cost point of view. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 8, 2015 Author Report Share Posted June 8, 2015 go and check the price of the dc-link capacitors, they start at $65 each 2 x 680uf in series is 340uf, and you really don't want much less than that. there are no dc-link caps that are rated at 1kv anyone find something else that works, let me know. The board with 6 caps will not fit in the box. and when did the stax mafia ever care about cost. Quote Link to comment Share on other sites More sharing options...
PretentiousFood Posted June 8, 2015 Report Share Posted June 8, 2015 I've used the new-ish Wima DC link stuff (MKP5) to good effect. I think 100uF was $40 or so, and they're available in 1kV ratings. 340uF is closer to $100. Vishay and Panasonic have some really nice stacked film ones for closer to $25 for 1300V, but only up to 40uF. Put the cheap one in a capacitance multiplier. Quote Link to comment Share on other sites More sharing options...
s_r Posted June 8, 2015 Report Share Posted June 8, 2015 Where did you see 680uf/550V caps for $32 kevin? Could only find this kemet cap on mouser. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 8, 2015 Report Share Posted June 8, 2015 It would be useful to show why that much is needed, and if there are other ways of achieving PSRR (good CCS do this), assuming that's why you need so much. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 8, 2015 Author Report Share Posted June 8, 2015 (edited) must have been this one http://www.mouser.com/ProductDetail/Kemet/ALC10A471EH550/?qs=%2fha2pyFaduiSZ6OZUNKt4DuxC7ZDm5IYWUwoUPG7%2fWYdqC%2fg%252be%252bejA%3d%3d which is 470uf and actually the board is layed out for 35mm caps, and this one is 40mm evidently too many windows open and copying from the wrong place circlotrons need stiff power supply. if you are talking about constant current sources, you don't understand how a circlotron works. its a balanced voltage buffer with no voltage gain, and the center voltage is the bias for the output devices The wima caps are pretty tall, so now the power supply has to be mounted T2 style. might fit that way. Edited June 8, 2015 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 8, 2015 Report Share Posted June 8, 2015 Right, what I meant to ask was if there were topological elements that more or less made the power supply performance a moot point, similar to a plate CCS dealing with PSRR. It sounds like the answer is no and the final design takes on the "sound" of the PSU to a certain extent. Again, perhaps film caps are a better choice here. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 8, 2015 Author Report Share Posted June 8, 2015 (edited) The ragnarok does not have regulated power supplies but is CRC and the caps are 1000uf/63v (at least I remember that was what it was) also size limited due to the box. you can get away with unregulated supplies at 50V, but at 900V, no way. The bigger atmaspheres are rows and rows of big caps. I have about .5 inch between the power supply boards with the right caps. inside of the box is 14.1 inches (have not actually measured it) and the boards are 6.6 inches each. vertically the box is 8.2 inches and the boards are 7.5 inches the smaller kgsshv power supply is 7 wide by 6.5 high its gonna be real tight. have to fit 3 transformers, iec,xlr,pot 2 amp boards and 2 output boards it has to be a standard chassis otherwise few will be able to build it and remember that the output wires on the power supply have to be at least 1kv rated Edited June 8, 2015 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
JimL Posted June 9, 2015 Report Share Posted June 9, 2015 (edited) Kevin Gilmore said: "when did the stax mafia care about cost?" So much for my chances of becoming a member of the stax mafia. Ever since Peter Aczel tried to insult the Boston Audio Society by sneering that they wanted audio nirvana for $79.95, that's been an unofficial motto of mine. Coincidentally or not, the price of an assembled Dynaco MkII, Mk III or PAS2 was - $79.95. Edited June 9, 2015 by JimL Quote Link to comment Share on other sites More sharing options...
Kerry Posted June 10, 2015 Report Share Posted June 10, 2015 I just saw the schematic for this - It's official - I've shat I love the visual from Laowei Quote Link to comment Share on other sites More sharing options...
nopants Posted June 10, 2015 Report Share Posted June 10, 2015 The ragnarok does not have regulated power supplies but is CRC and the caps are 1000uf/63v (at least I remember that was what it was) also size limited due to the box. you can get away with unregulated supplies at 50V, but at 900V, no way. The bigger atmaspheres are rows and rows of big caps. I have about .5 inch between the power supply boards with the right caps. inside of the box is 14.1 inches (have not actually measured it) and the boards are 6.6 inches each. vertically the box is 8.2 inches and the boards are 7.5 inches the smaller kgsshv power supply is 7 wide by 6.5 high its gonna be real tight. have to fit 3 transformers, iec,xlr,pot 2 amp boards and 2 output boards it has to be a standard chassis otherwise few will be able to build it and remember that the output wires on the power supply have to be at least 1kv rated In your envisioned chassis layout is there anything that makes use of the non-walled height? Sounds like it might make sense to mount the transformers on the bottom and stack the PSU over those. This amplifier sounds like it'd be a good candidate for a remote-only volume control...unless you use a lazy susan as a knob Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 10, 2015 Author Report Share Posted June 10, 2015 figuring on the transformers at least 20% bigger than the t2 transformers so say 4 inches diameter and 2.5 inches thick the power supply boards are 7.45 x 6.48 and the height will be that of the power caps the amplifier board and output board should stay at 6.28 x 3.37 the kgsshv power supply is 6.92 x 5.16 and the same cap height chassis is pesante 5U monster amplifier box any other ideas, and i will certainly listen Quote Link to comment Share on other sites More sharing options...
JoaMat Posted June 10, 2015 Report Share Posted June 10, 2015 just curious, what are the specifications of trafos? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 10, 2015 Author Report Share Posted June 10, 2015 the one would be a 450v version kgsshv transformer the other 2 are 4 x 380vrms @ 100 ma each Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted June 12, 2015 Report Share Posted June 12, 2015 This is tight... 2 Quote Link to comment Share on other sites More sharing options...
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