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Old 29th January 2003, 07:09 PM   #41
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Default Kaneda 1995 preamp, power supply schematic, negative rail

OK, no further comment necessary ...
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Old 29th January 2003, 09:48 PM   #42
jam is offline jam  United States
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Hartmut,

Thanks. That has been very helpful. I wonder if Jonathan Carr would care to comment. This has been a very useful thread.

Jam
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Old 29th January 2003, 10:10 PM   #43
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Default KANEDA

Hi,

Jam,

I looked around for a diagram of the "Le Solstice" preamp,so far nothing turned up.

However here's an overview of everything that appeared in the "L'Audiophile" issues:

L'AUDIOPHILE

I have copies of most of them and have noticed quite a few articles are available on the French servers too.

You may be aware of this but quite a number of ISPs have been infected by the latest worm virus and are unavailable right now.

So be patient and I'll try to give a few links in a while.

If I seem to forget,just remind me.

Cheers,
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Old 29th January 2003, 11:08 PM   #44
mlloyd1 is offline mlloyd1  United States
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This has indeed been a very good thread; my favorite in a while.

This Kaneda 1995 preamp looks AMAZINGLY similar topologically to the Leach JFET preamp from the late 70's (look at this pdf, starting page 9 ) I built the RIAA stage many years ago and was very pleased with the sound, even using the lowly 2N5457 NJFets!

mlloyd1
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Originally posted by jam
Hartmut,

Thanks. That has been very helpful. I wonder if Jonathan Carr would care to comment. This has been a very useful thread.

Jam
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Old 30th January 2003, 12:00 AM   #45
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Default SOLTSTICE

Hi Jam,

SOLSTICE

An opportunity for a fan perhaps?
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Old 30th January 2003, 12:06 AM   #46
mlloyd1 is offline mlloyd1  United States
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sorry for my earlier post - i completely missed the earlier messages that said basically the same thing

too much work, must go home now
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Old 30th January 2003, 12:18 AM   #47
jam is offline jam  United States
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Frank,

I shall have to talk to Mr.Pass about handing over a few of those famous fans.

Mlloyd,

I hope we can keep this going and get a good collection of schematics and ideas.

Jam
P.S. After this winds down maybe we could start a folded cascode thread.
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Old 30th January 2003, 12:25 AM   #48
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Default FANS...

Hi,

Quote:
I shall have to talk to Mr.Pass about handing over a few of those famous fans.
Pass it on.

Seriously,this preamp has a lot of potential left untapped.

I said it before,I'm not into solid state devices but this preamp is one I could live with.

One the frenchies are back on their feet I'll search for more goodies.

Cheers,
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Old 30th January 2003, 06:42 AM   #49
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Default Re: SOLTSTICE

Quote:
Originally posted by fdegrove
Hi Jam,

SOLSTICE

An opportunity for a fan perhaps?
quite the normal price, there has been one in Germany together with 30W Hiraga Le Classe A power amp for 1500 EUR, from a Swiss seller.

But you are right, they are quite rare, these both have been the only Solstice ads I ever have seen.

regards,
Hartmut
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Old 30th January 2003, 07:28 AM   #50
jcarr is offline jcarr  United States
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Jam:

>What is your reason for using regulators for cascode biasing in place of zeners. Lower noise?<

Low noise in combination with a low and flat impedance curve.

>And what type of regulators do you use?<

I start out by looking at what I want to accomplish in terms of performance goals, and also at my budget in terms of circuit-board area, weight, heat, mechanical complexity, and monetary cost. I then come up with a regulator topology that is suited for the job. In the Connoisseur Definitions 4.0, which is the folded-cascode example that I kept in mind for the purposes of this thread, each amplifier module uses 12 regulators, so I have tried to keep each regulator relatively simple and compact. These are two-part series regulators using discrete semiconductors, with the first part of the regulator acting as a cascode for the second. There is a review of the Connoisseur 4.0 in the latest issue of HiFi+ (actually, it is part of the Boulder review), so you can read how these ideas translate into sonics in the real world.

Regarding the Kaneda amplifier circuits, there was another design generation where the active RIAA was driven directly from the collector of the second-stage sans follower. However, a summing current mirror was present under the second-stage differential.

Here (the circuit that Hartmut posted) it looks like Kaneda is trading some measure of simplicity and ease of construction for performance. No cascoding for the input JFET pair, and no attempt to stabilize the current sources feeding the second-stage differential (which has higher gain than the first differential).

regards, jonathan carr
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