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Old 22nd January 2006, 11:17 PM   #201
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Unhappy Bob Crump was a good friend...

Bob Crump was a good friend.

Great guy.

Passionate about his audio fer sure.

Bought one of my Symphony amps, my cables and interconnects, his reference for many years, exhibited at CES with my amp... he loaded it in the back of his Turbo VW (performance chipped) and drove it up to 'Vegas at least one year... just talkin' with Bob was quite a thing!

I remember when he told me he was going to go into the biz, and about the Blowtorch... ahhh well.

Been too busy to be online here very much over the last weeks...
I spotted the thread on the Blowtorch... :-(
Only to find that Bob has passed away.
I was having a pretty good day up until then.
Bummed my space, big time.

That's a big vacuum to fill up.

crap.

_-_-bear


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Old 23rd January 2006, 12:22 AM   #202
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Hi Bear, Isn't that your silver hook-up cable in the preamp? I love the stuff!
 
Old 23rd January 2006, 12:33 AM   #203
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Just wonder if John Curl will comment on where audio is going to be in the future. Futurists like Ray Kurzweil talk about how rapidly technologies are advancing. Are there going to be large breakthroughs in audio technology? Major advances in transducers around the corner? Thanks for any thoughts.
 
Old 23rd January 2006, 12:45 AM   #204
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John,
I have been embroiled in this Lovoltech power JFET thing and haven't made time to read this thread. Currently, I'm up to page 10 and want to drop in a comment or two and a question before I forget, then I'll go back to reading. I'll ask your pardon if this has been covered between p10 and here.
--I have long been a proponent of using regulators for each channel and for each stage. This has earned me more than one strange look and quite a few unkind comments.
--I have, over time, simplified my regulators. I used to go with one really, really over-the-top regulator coming from the rail directly to the circuit. I now tend towards two, sometimes three regulators, each reducing the voltage a bit, rather than all at once. I'm not sure why it sounds better this way, but I like it.
--I have experimented with electrolytics, films, and sometimes no caps at all after the regulators. Since regulators tend to function as low-pass filters, I find that electrolytics back towards the transformer end of things are not too big a problem, although I don't care for them after final regulation and before the circuit. Film caps are best here.
Now for my question:
Have you found that not having a cap after the final regulation tends to cramp dynamics?
I've observed that it's possible to get really, really beautiful sound at low signal levels, but that a peak falls utterly flat, dynamically.
To the extent that it's possible to design a circuit that has essentially DC current draw (e.g. differential) that can lessen the problem, but it's not always feasible to do so.
Comments?

Grey
 
Old 23rd January 2006, 12:55 AM   #205
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John,
Ah...in your post on the next page (#108), you make much the same point that I do about cascading (I have a mental image of water cascading down a mountainside, each step lower--you, quite correctly, say series) regulators.
But why does this sound better? I can hear it, but the reason has eluded me.

Grey
 
Old 23rd January 2006, 01:36 AM   #206
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Cool worse

Quote:
Originally posted by GRollins
John,
Ah...in your post on the next page (#108), you make much the same point that I do about cascading (I have a mental image of water cascading down a mountainside, each step lower--you, quite correctly, say series) regulators.
But why does this sound better? I can hear it, but the reason has eluded me.

Grey

In my experience it does sound worse!
 
Old 23rd January 2006, 01:55 AM   #207
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Hi Elso, glad you mentioned that. I didn't want to be the first with the bad news
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Old 23rd January 2006, 02:05 AM   #208
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Can you make it sound worse? Of course. It depends on what you're using for a regulator circuit.

Grey
 
Old 23rd January 2006, 02:06 AM   #209
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Quote:
Originally posted by GRollins

Ah...in your post on the next page (#108), you make much the same point that I do about cascading (I have a mental image of water cascading down a mountainside, each step lower--you, quite correctly, say series) regulators.
But why does this sound better? I can hear it, but the reason has eluded me.
Grey, I would guess the regulators are each successively cleaning the rail of mains garbage?
 
Old 23rd January 2006, 02:31 AM   #210
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Possible, but I lean more towards the idea that a single big regulator, meaning one hefty enough to drop a reasonable amount of voltage and current at the same time, is going to require a larger device, be it FET, bipolar, or MOSFET.
All other things being equal, a large device is generally noisier. (Yes, I'm going to try the Lovoltechs in regulators, but bear in mind that there are no P devices for the negative rails.) That device-generated noise will require filtering, which will mean caps, inductors, or another stage of regulators. So you end up with this infinite regression of regulators to filter the residual junk from the upstream regulators.
In other words, the regulators themselves become the problem.
Smaller regulators, needing to pass the current (in the case of series regulators), but not necessarily a lot of voltage can use lower noise, higher quality pass devices.
However, this is only a hypothesis. I was hoping that John might comment on this and my earlier question about dynamics.

Grey
 

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