John Curl's Blowtorch preamplifier - Page 3

jacco vermeulen · 9th January 2006, 11:18 AM

Al,
the cost of an extrusion mold of this size is immense.
My bet is on aluminium sand casting, and CNC machining finish.
Those 3 boys do love teflon.

Elso Kwak · 9th January 2006, 12:34 PM

Quote:

Originally posted by Terry Demol

That case was machined from a solid chunk of aluminium

Cheers

Terry

Does that improve the SOUND of the unit Terry????

Elso Kwak · 9th January 2006, 12:37 PM

Quote:

Originally posted by Upupa Epops
What is nice at this construction, which look like sparrow nest, Hugh ? Expensive switches and silver wires ? Or extruded chassis ?

You think electrons get lost Upopa? OMG.

Christer · 9th January 2006, 12:41 PM

To be a real audiophile case it probably has to be milled out of a solid block of silver and then be plated with platinum over gold.

Terry Demol · 9th January 2006, 01:04 PM

Quote:

Originally posted by pinkmouse
I'm with Pavel, really, really ugly wiring.

Oh, and that chassis looks like a U shaped extrusion with top, bottom, and back plates to me. Good idea though.

The bottom is not a separate plate. If it was, it would not have the
milling cutter witness marks on it but a rolled or linished (brushed) plate finish.

Quote:

Originally posted by jacco vermeulen
Al,
the cost of an extrusion mold of this size is immense.
My bet is on aluminium sand casting, and CNC machining finish.
Those 3 boys do love teflon.

I'm not so sure. Sand cast aluminium is quite porous and does not
hold a really high finish as would be required on the front panel.

I wonder if JC is around for a comment?

Cheers,

Terry

jacco vermeulen · 9th January 2006, 01:05 PM

I am not able to post the full size picture, the bottom has artefacts in it.

I've seen those constructions Elso posted briefly, even read the manual.
It is possible to open one, but you never get it shut again.

Elso Kwak · 9th January 2006, 01:07 PM

Quote:

Originally posted by jacco vermeulen
I've seen those constructions, even read the manual.
It is possible to open one, but you never get it shut again.

Pandorra's box then?

jacco vermeulen · 9th January 2006, 01:10 PM

Pleased to meet you, Pandorra.

Christer · 9th January 2006, 01:11 PM

Actually, when I think about it, there are plenty of similar cast alu boxes available from my local electronics supplier. The price gets a bit high for large boxes, but nothing extreme. The largest box I found was about $100, but is probably a bit smaller than the Blowtorch one.

jbaudiophile · 9th January 2006, 01:11 PM

Nice model... Really good handcrafted... Nice polishing too... Apart of a visible white veil all over the case... Sadly enough !

LOL !

J-B

9th January 2006, 01:05 PM	#26
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	I am not able to post the full size picture, the bottom has artefacts in it. I've seen those constructions Elso posted briefly, even read the manual. It is possible to open one, but you never get it shut again. __________________ Looks like Sponge Bob has killed another thread.

9th January 2006, 01:10 PM	#28
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Pleased to meet you, Pandorra. __________________ Looks like Sponge Bob has killed another thread.

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9th January 2006, 12:41 PM	#24
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	To be a real audiophile case it probably has to be milled out of a solid block of silver and then be plated with platinum over gold.

9th January 2006, 01:11 PM	#29
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	Actually, when I think about it, there are plenty of similar cast alu boxes available from my local electronics supplier. The price gets a bit high for large boxes, but nothing extreme. The largest box I found was about $100, but is probably a bit smaller than the Blowtorch one.

9th January 2006, 01:11 PM	#30
jbaudiophile Account Disabled Join Date: Apr 2004 Location: Cysoing, near Lille	Nice model... Really good handcrafted... Nice polishing too... Apart of a visible white veil all over the case... Sadly enough ! LOL ! J-B

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