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Old 17th June 2004, 02:39 AM   #241
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The cross connection required for "X-ness" would make an
interesting comparator to a couple of reasons.

1) Both halves of a balanced class D system would enjoy
well synchronized switching

2) The low impedance loading of the Sources of the comparator
inputs could enjoy the kind of speed that Seymour Cray had
with emitter coupled logic.

3) Cool idea. You're the first to mention it.
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Old 17th June 2004, 02:48 AM   #242
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I never undersood how someone could go from building an A75, to an Aleph 2 to An Aleph X, then digress to playing with highly current limited no imagination spec sheet chip amps. They may sound great, but there's no artistry. It's like a master carpenter going from building curved raised panel funiture to installing drawer pulls on melamine kitchen demos at Home Depot.

The problem with large class A amps is my time to dink around with my electrics is after 9:00 PM After I've showered and am settled into my nice air conditioned house, I don't want to go intoo the hot garage and get all dirty at the drill press.


Brian/ missing the excitement of activity in Pass forum
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Old 17th June 2004, 03:06 AM   #243
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This is all entertainment, and thus subject to fashion.

For 35 years I've watched it come and go.

Just because nobody here has done anything wildly
original with chip amps doesn't mean that there isn't
a wealth of possibilities.

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Old 17th June 2004, 03:09 AM   #244
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You could try the chrome plated knobs or the brushed nickel ones. Three spikes or four.

Add whatever embelishments you want to the case, but it's still a quasi complementary text book three stage amp with current mirrors etc ad nausium.

Do away with the chip and just make art if that's what gets you off.




Who am I to say. There are many worse things we could do with our time.
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Old 17th June 2004, 03:23 AM   #245
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Quote:
Originally posted by Brian Donaldson
Add whatever embelishments you want to the case, but it's still a quasi complementary text book three stage amp with current mirrors etc ad nausium.
It's not the material, but what you do with it.
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Old 17th June 2004, 05:42 AM   #246
Variac is offline Variac  United States
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What's that up your sleeve Nelson? Wha? It's a chip!!!!!
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Old 17th June 2004, 07:24 AM   #247
AuroraB is offline AuroraB  Norway
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Location: Norway, -north of the moral circle..
After following this thread from the beginning, it seems like Uli and Petter were the only ones to get anywhere with this, and I too wonder if there has been any progress..............???

Judging from the comments, the Aleph-X is most probably a fine amplifier, however all the Alephs are somewhaat like "hot-houses" with their SE tchnology. Not that we don't need heat at my latitudes, but still,- it would be intereresting to see the thread get alive again.
The other day, Nelson tipped us off of the original diagram for the X--1000 ( and 600), and there's indeed some topological differences, particularly vs. Uli's design....
Now..............Petter and Uli...???? Still out there..??

Contrary to other posters, I don't mind gettting some dirt from the drill press after 9 PM, but unfortunately I got myself engaged in some other bussiness that still needs a few months to be ended. 24 hrs i just not enough pr.day at these times,-but now finally I do see the light at the end,-- just hope the roof still holds......
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Old 17th June 2004, 08:30 AM   #248
MBK is offline MBK  Singapore
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I'll second that, I am also curious about progress on the "normal" X version. The Aleph-X is hard to scale down for multi amping, because lowering rail voltage below 15 V or so hardly makes sense, and it is then still a bit much for the individual channels of a multi amp setup.

The "normal" X however can be set to a reasonable Class A bias, say 10 W, while running higher rail voltages and thus preserving a nice AB peak capability.

Interestingly NP himself uses Aleph X for the lower end of the Rushmore, and "simple" Alephs for the upper channels in the Rushmore, if I understand the brochure correctly. But there may be a variety of reasons for this, including cost, perceived value of the various amp topologies in the market etc.
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Old 17th June 2004, 09:54 AM   #249
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So let the cat out of the bag, Nelson,

bridged - X - gainclone anyhow?





Till/ will keep listening class a
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Old 17th June 2004, 04:19 PM   #250
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Quote:
Originally posted by till
So let the cat out of the bag, Nelson,

bridged - X - gainclone anyhow?
I believe I addressed something like that in the
Monolithic SuperSymmetry Thread.

If I do something in this area, I'll try not to boor you
by repeating myself. At the moment we are simply
playing with a variety of chips.

We're just like monkeys in a cage here, throw anything
in and we'll give it serious consideration when were not
playing with ourselves.
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