This is not just another gainclone

[fdegrove]

Hi,

That looks realy great Peter, but doesn't the magnetic field create a problem for the electronics?

Had the exact same reaction...
What exactly is magnetically suspended and how is the magnetic field kept out of the electronics?

Just wondering,

 

[purplepeople]

If the field doesn't fluctuate then, no currents. But of course, the point of suspension is to damp motion... Also would there be a reverse Hall effect?

ensen.

 

[fdegrove]

Hi,

If the field doesn't fluctuate then, no currents.

And you never even considered telling our fellow member SE this ???

Cheers,

 

[purplepeople]

I've been told in some cultures, those are fighting words... (heh!)

ensen.

 

[fdegrove]

Hi,

I've been told in some cultures, those are fighting words...

 

[Peter Daniel]

Hi,

What exactly is magnetically suspended and how is the magnetic field kept out of the electronics?

I found it here. Check 'project' section

http://www.kedab.se/

 

[Peter Daniel]

Whew! It's nice sometimes, when you aren't setting the standards. Of course, now that you've got inspiration, that probably just means more perspiration for the rest.

ensen.

Here's my yesterday's project. S&B TX 102. It is indeed what they say.

 

[KevinLee]

Peter,

Very nice looking stuff as usual.

I cannot wait until I have a proper work shop to attempt things similiar to yours. ( I can only do so much on the kitchen table between meals).

Cheers!

KevinLee

 

[Squalish]

Where do you get the blocks of acrylic cheaply enough to use them so frequently?

 

[Peter Daniel]

I've got two sources for acrylic. One is a surplus store which sells it for $2.5/lb, the other is plastic warehouse and price there is almost doubled.

PS: If you look carefully you'll see 3 acrylic structures in my pic It seems like acrylic works pretty well in all sorts of platforms, but I also noticed that sometimes it produces a signature that may not always be desirable.

 

[moe29]

a little more info on that last picture Peter?

is that one of thouse transformer pre-amps?

thanks

 

[purplepeople]

Peter, you have a sickness, man! Your stuff is so good that I wouldn't be surprised if the fabs were paying you to keep it off the market.

Kudos, yet again.

ensen.

 

[Peter Daniel]

It's still not finished, just hooked it up temporarily, but my first impression is in accordance what Kuei said on Audioasylum:

http://www.audioasylum.com/audio/tweaks/messages/54440.html

I'm sure this passive pre has some sort of sound or some kind of reduction in transparency (it would have to for all the solder joins and connectors plus switches), but I can't nail it down, at least not with CD as source. The only way to describe the "sound" is to steal a phrase from Romy the Cat - this unit is INSULTINGLY NEUTRAL.

….. This "Preamp" just gets out of the way of the music….

If you need all the audiophool drivel, I noticed a much more focused soundscape with increased extension into all directions. Individual sounds of instruments (like the bow scraping the strings, the resonating body of the Violin and the slight handling noises on the neck now occupy distinct sonic spaces, whereas I'm used to these sounds being more merged. Don't get me wrong, they have not become disjointed, but simply clearer.

….In terms of downward dynamic range (a term coined by Allan Wright) the system seems to have acquired an extra 6 - 8db of resolution, meaning that much in recordings that was previously buried and compressed by resistively attenuated linestages (passive or active) is now audible.

I'm quite impressed by that transformer volume stage. Will post more info tomorrow.

 

[Steve Eddy]

And you never even considered telling our fellow member SE this ???

Fellow member SE has been well aware of this for more than two decades already.

se

 

[purplepeople]

ROFL

ensen.

 

[Peter Daniel]

A clamp in a CD player is a magnet as well.

 

[Steve Eddy]

A clamp in a CD player is a magnet as well.

Yup. But if its field is symmetrical about its north/south poles and it spins on its polar axis, it shouldn't cause any problems.

se

 

[agent.5]

Nice TVC build. Just wondering if you need some EMI shielding for all the exposed wires.

 

[Peter Daniel]

They will be shielded with aluminum plates.

 

[Steve Eddy]

They will be shielded with aluminum plates.

That won't do any good for shielding against magnetic fields. At least not at power line frequencies. It'd be about as good as that acrylic.

se