kevin gilmore

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

so 2 of the 3 simulators i use gave the same results for the power supply with the schematic shown. But ltspice oscillates. Kerry made the following changes, until i build the real thing, will not know which is right. C3,C16 4.7nf C4,C5 470pf c9,c12,c8,c15 not used no changes to the circuit board necessary for this i think

if you want to have the power supply boards made from my posted files and send one to me, i will test. If you are sure that the board matches the schematic

i will be testing the new amp boards when i get them will order the power supply board soon i'm sure i can do a completely off board version of the power supply board

not exactly. dynahi has cascade on the input transistors because that was right at the limit of the fets. the bipolar part has 6 more volts rated, so cascade technically not necessary. Also vas stage has double transistors for more output current. otherwise identical. dynahi was also +/-30 and the ssdynalo was +/-20 although you could raise it a bit. boards have cleared customs should be here by Friday, and I have the parts to build and test them. once they are verified working (and I have checked the layout many times) people could go ahead with a group buy. birgir is getting me prices on the power supply.

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

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.

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.

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

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

i thought you had the off board version and were testing without a heatsink. .75 volts across 10 ohms is 75ma x 4 output devices is 300ma

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.

if you mess with the bias and change the opamp to opa445 you can get it to work. the input chip can handle 36v, should just make it with 30v rails all the transistors are rated at 80v, so should be ok. caps would have to be at least 50v, 25v won't work

could also use this power supply for a DHT amp. and the parts cost is going to be up there, but not T2 levels.

you can't do that without a heatsink, not even for 10 seconds

http://gilmore.chem.northwestern.edu/circlotronhvps.jpg !!! no ground plane on that one, everything floats It fits in the 5U pesante amplifier chassis with room to spare. 3 x power transformers mounted to the back panel hv power supply mounts vertically, one on each side kgsshv power supply mounts vertically on the bottom (not a lot of heat because less current draw for the gain stages) either gain stage board, 1 each side mounting vertically and output stage board, 1 each side mounting vertically of possibly gain and output stage on the same board. (going to be close)

http://gilmore.chem.northwestern.edu/circlotronps.pdf birgir seems afraid. birgir is NEVER afraid. uses the 550V caps which are $32 each, and you need 10 plus 10 of the 500V versions

this will definitely fit in the case i did for the krell, but might fit in the smaller case.

there are 4 different designs now for the ksa5. the first power supply is the double zener thing. the second one is the alternate ksa5 power supply which is fully regulated. the third one is a shrunk version of the second one. the 4th one is the goldenreference board. the goldenreference is a different although similar design. about a factor of 100 less noise. my version of the Chinese thing has an extra current source in the front end, more current delivery due to darlington output, and way better and more accurate reference. and current sources that are very stable (none of that e series crap) to change for higher voltages, you change the lower feedback resistors and the power transformer. R7 and R10 http://gilmore.chem.northwestern.edu/goldenreference.pdf and I know the protection diodes are missing from the schematic. 2000 labels fixed in the zip file going to be way more stable than sigma22 and bunches less noise. its good for 500ma, maybe more. will have to test. so for dynahi, you need 2 otherwise you need one, and it works at any voltage 15,20,22,24,30 if you really want it to do 12v then you have to change the reference to 5v and technically you might want to adjust the zener D4,D6 to be roughly half of the desired output voltage. as shown its 20v for the ssdynalo i could do an off board version with flying output transistors, then on big heatsinks, as much power as the transformer can supply

i would open up the top and take a look in complete darkness and see if something is arcing to somewhere or you hear a physical noise in the amp

yep, that is where I bought mine, no wonder I could not find the invoice

finally a bom for the current boards http://gilmore.chem.northwestern.edu/ssdynalobal.xlsx

I have never tried it. not available in plastic insulated tab, so you would have to make sure the insulation is right. at least its low voltage

.75V

it was a greenlee, I had to order it from Newark and it came from Germany. it was about $200. birgir has one too, (and he posted pictures of the one he broke) so he can dig up the part number easier.