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In the Forum: Audio Discussions
In the Thread: How to get a LOT of SET power.

Post Subject: Me...Posted by N-set on: 3/31/2011

...but it will take me N-years and I'm in EU Smile

I could make some preliminary steps this Easter, talk to my winders about transformers etc.
I'm for sure missing the FW and out put cores (AMCC800A will not support 120H at 300mA, low DCR),
but getting mastodont C-cores in Poe-land is not impossible...for a good price.
The driver: I have no better idea at the moment and worse, I'm not sure if the current idea, Sakuma-style, is any good either.
3.3k is not a little and your 2-stage contrarint gives no chance foe a step-down transformer.
I've been trying to find a Spice model of 833 to play with it a bit. Anyone has it?

SchutzStaffel---one could in principle connect in series 4x 1200V SiC's, I'm wondering
if that would be cleaner, switching 1670V, than MV's, which are a PITA to implement and generate a lot of RF.
They need a CM-chokes at the heaters, ferrite beads at the plates and an electrostatic cage
apart from the all the heating ass-related problems, so SS might be the way.
Caps: in US for sure much easier to get (lasers), but ocassionally in EU also:

http://cgi.ebay.com/9x-HUGE-MONSTER-RFT-OIL-CAPACITORS-50uF-2-3kV-2kV-3kV-/350449979135?pt=LH_DefaultDomain_0&hash=item5198724eff

If one loves electrolits and mega uF, one could stack 550V Nichicons. They seem $$$$ at Mouser Digi-srigi etc, but if you ask
directly in China I've been quoted $160 for 4pcs 10.000/550V NIB! I haven't examined the source though.

What I'd love to know is how people abuse GU-48. There are for sure people who tried moving past the official data.
I'm wondering what problems and what measures to deal with them they have developed. Any such insider info Romy?
How is GU-48 at 400W air cooled?? How is 6.5k load at that point?

Paul, I'm sorry but I have no idea what are you talking about. What giant-wire capacitance? You mean 150u/2kV
It's not impossible. I've seen once 100u/22kV cap on US Ebay. There are plenty of those big caps for lasers.
What 70H do you mean? The input choke at this volatge/current is "only" 10H but has to withstand lots of AC. I have such chokes, they
are of a size of a good 100W output transformer. The second choke is left open, I'd have to play with the values
so that the PS does not oscillate at the sudden current changes. EMF--all magnetics potted and then hidden in the chhassis,
so effectively double-potted, cores rotated to minimize craoss-talk, RF filtering, etc.
The size...well a 1/2 of a small fridge I'd say, close to 1kW dissipation
each monoblock. A serious toy.

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