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Old 9th September 2012, 09:04 PM   #7311
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That RIIA is weird, sounds great though. Needs a good pre-pre or transformer for MC use i think.
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Old 9th September 2012, 09:14 PM   #7312
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I never heard it , but I like what I see ; boyz are totally wakoo

anyway - I posted that because of their choke input filter ; I'm counting that they're knowing their drek (contrary to ZM , who knows only station )
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Old 9th September 2012, 09:14 PM   #7313
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Absolutely. Needs some Millivolts frome the pickup. I had best results with a Goldring 2500.
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Old 9th September 2012, 09:18 PM   #7314
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Quote:
Originally Posted by Zen Mod View Post
I posted that because of their choke input filter ; I'm counting that they're knowing their drek
Be sure they do - and they do all of their inductors by themselves. And as they tend to use BIG cores, I am sure those won't have any problems with that DC preload. As I said earlier - totally dfferent from one of those usual common mode filter choke toys.
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Old 9th September 2012, 09:25 PM   #7315
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Originally Posted by Holger Barske View Post
......As I said earlier - totally dfferent from one of those usual common mode filter choke toys.
conditio sine qua non

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Old 9th September 2012, 09:44 PM   #7316
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Quote:
Originally Posted by RCruz View Post
I mean using chokes before the 220v windings
.
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File Type: jpg Metro pre.jpg (318.6 KB, 353 views)
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Old 9th September 2012, 11:03 PM   #7317
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Sure, when you know your equipment a line filter can be designed in that perfectly fits.
Unfortunately besides making your own sine waves there is no universal line filter.
I know because i designed 90kW DC power supplies for sputtering in the 80th.
Also AC with microwave.
It has exactly to fit or we end up with all kind of resonances. Some filters even put dirt back into the line.
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Old 9th September 2012, 11:10 PM   #7318
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The company i worked for is long extinct but that is what we made :ELAN-Plasma-Drive-Service, Büttelborn - Firmen
Thinking about it i am not so crippled PSU wise as i think. One on my duties was to check for short circuit protection. Have you ever short circuited a 90kW DC supply ?
I did that with a 2m long bakalite stick. I could throw flashes that could enlighten Berlin.
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Old 9th September 2012, 11:16 PM   #7319
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To tackle ripple we used the resonance principle. That was a bank of big MP caps and huge coils. The cap values where surprising low because of the coils.
One problem was to optimize efficiency, such a PSU can cause a lot of blind current that lowers the energy ticket but also efficiency. The impedance curves we calculated remind me on a complex loudspeaker load. We used similar techniques to flatten the impedance curve. My boss was a big HighFi freak. With tubes of cause and ribbon speakers.
He was a character, also involved in designing atomic reactors when they where new.
He stepped out of that busyness though because he did not trust the safety measures.
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Old 10th September 2012, 07:55 AM   #7320
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Quote:
Originally Posted by Zen Mod View Post
food for thoughts , and test , one of these days ....

in a meantime , worth to look

The NEM AI-50



Click the image to open in full size.
Allready love it even without hearing the beast.

Nice explanation about coiled psu in 6moons review also.
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