i'm on a roll... the kgsshv

[nopants]

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

[kevin gilmore]

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

[nopants]

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? 

[kevin gilmore]

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.

[nopants]

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

[JoaMat]

/

Edited November 11, 2015 by JoaMat

[kevin gilmore]

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

[nopants]

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?

[luvdunhill]

With a cyclotron, could you argue that the PSU caps are "in the signal path"?

[kevin gilmore]

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

[luvdunhill]

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.

[kevin gilmore]

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.

[PretentiousFood]

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. 

[s_r]

Where did you see 680uf/550V caps for $32 kevin? Could only find this kemet cap on mouser.

[luvdunhill]

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.

[kevin gilmore]

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

[luvdunhill]

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.

[kevin gilmore]

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

[JimL]

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

[Kerry]

I just saw the schematic for this - It's official - I've shat

 

I love the visual from Laowei

[nopants]

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

[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

[JoaMat]

just curious, what are the specifications of trafos?

[kevin gilmore]

the one would be a 450v version kgsshv transformer

 

the other 2 are 4 x 380vrms @ 100 ma each

[johnwmclean]

This is tight...