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Old 28th October 2002, 07:45 PM   #41
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Default Re: subjective results cannot be repeated

Quote:
Originally posted by Joel
Well, yes, that is what everyone seems to fall back on - "I can hear a difference - if you can't, don't do it". That really shuts down the learning process though, doesn't it?
LOL.
By every objective measurement we have a SET is much worse than any other topology, yet many advocate them as superior. You may prefer them, and that's fine, but you can't have it both ways.

As for not being able to measure the difference between PSU topologies, well, I've done it and it's quite obvious.
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And, yes I do advocate a certain minimalist apporach - but isn't that the essence of what makes a tube amp sound better than a Sony?
Not IMO. The inherent linearity of many tubes and their ability to swing voltages far greater than most SS stages can (no overload and relatively constant distortion spectrum vs level) are two of the main reasons for it's clarity.
However, there are people who like rubbish like 12ax7's which have a lot of distortion due to a poor transfer.
Be careful not to forget Eistein's maxim (paraphrased here): as simple as neccessary, but no simpler.
Quote:
Everyone always asks "why do tube amps sound different than SS amps"??? Look at the topologies! A williamson sounds a lot more like my 150W Soundcraftsmen MOSFET amplifier, than a single ended triode with 9 parts in it.
There are lots of reasons why tubes are often better than SS. I agree that the average Williamson isn't very good, but it would be a very poor one that sounded like a Soundcraftsman. However there are other topologies in PP than a Williamson.
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So, I think active regulation, OTL designs, current sources, and complex PSU's are heading in the wrong direction.
Have you tried any of these, or are you merely extrapolating a thought process?
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Old 28th October 2002, 08:03 PM   #42
Joel is offline Joel  United States
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Hmmmm, that's a lot to chew on...

I don't like 12AX7's either - but mostly because so many other people do!

transistors are current devices Brett. They don't swing voltages much at all.

tubes are not very linear compared to even poor ss devices. Thank god music is not a test signal, eh?

The Soundcraftsmen amp is pretty damn good sounding, BTW. But it is missing something..... [tubes]

No, of course I have not built all of those - so maybe I should just keep a lid on it.... but who has?
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Old 28th October 2002, 08:17 PM   #43
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Quote:
Originally posted by Joel
transistors are current devices Brett. They don't swing voltages much at all.
I'm aware how transistors work.
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tubes are not very linear compared to even poor ss devices.
That is not correct
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No, of course I have not built all of those - so maybe I should just keep a lid on it.... but who has?
Except for the OTLs, I have.
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Old 28th October 2002, 08:36 PM   #44
Joel is offline Joel  United States
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Default ... and back to the topic

Arnach,

I know a simplified power supply would be fine for this amp. Why not try that first, and then if you don't get the results you're looking for, go for the larger, more costly one? (especially if you're considering BG caps).

As Brett said, as simple as needed, but no more.

The black gates do look cool though, I have to admit. I'm not above picking parts because of pretty packaging...
You should see the 1MF oil coupling caps I used in an '01-A preamp.
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Old 28th October 2002, 08:49 PM   #45
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Default DIY

Hi,

If I'm on a budget I don't design for my own use,I design for someone elses budget.
Think they call that "engineering".
What's so wrong with getting it right first time?

I don't care much about BG caps unless I need big values for cathode bypass.
Which I try to avoid in the first place.
And MKV or PIO will outperform the BG anyway,so why bother?


Feed an opportunity. Starve a problem.

Peter F. Drucker.

Cheers,
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Old 30th October 2002, 01:19 PM   #46
arnach is offline arnach  United States
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Poo. Thanks for the advice, but the power supply I ended up with above simulates very, very well, and I will be using it. I am using Solen for the 100 uF values, and two in parallel for the 200uF value. Power supply w/o caps is costing me around $550.. Not bad.

Anyway, what I am really wondering is if the Tango NC-14 is suitable for this circuit? It has an Rp=5K and handles 30 mA.

Thanks,

Aaron
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Old 30th October 2002, 01:46 PM   #47
Joel is offline Joel  United States
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Default Not bad?

Quote:
Originally posted by arnach
...Power supply w/o caps is costing me around $550.. Not bad.
(Gulp).

I could build 2 complete amps for that much.
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Old 30th October 2002, 01:49 PM   #48
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Joel,

I kinda suspected it all along.
You must be an engineer.

Cheers,
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Old 30th October 2002, 02:11 PM   #49
arnach is offline arnach  United States
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Hell, I could build four amps for that price. And they would sound pretty bad. So what?
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Old 30th October 2002, 02:29 PM   #50
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Default Re: ... and back to the topic

Quote:
Originally posted by Joel


The black gates do look cool though, I have to admit. I'm not above picking parts because of pretty packaging...
You should see the 1MF oil coupling caps I used in an '01-A preamp.
They are not cool anymore, when you strip them out of the plastic jackets. And in the light of recent posts, I'm sure that arnach will do that.
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