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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 19th March 2013, 02:43 AM   #36871
Steve Eddy is offline Steve Eddy  United States
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Originally Posted by Kindhornman View Post
Triple chrome plated cast aluminum works for me.
Wood and hard rubber works for me.

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Old 19th March 2013, 03:29 AM   #36872
simon7000 is offline simon7000  United States
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Ed, is your CRC combination also loaded with 50 Ohms?
Yes
 
Old 19th March 2013, 03:42 AM   #36873
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by Kindhornman View Post
Triple chrome plated cast aluminum works for me.
You rather than me, the chrome polishing of my BT preamp clone (1988, all-side chromed panels on a welded chassis) drove me mad.
The reason I'm bothering you folks.

http://www.diyaudio.com/forums/attac...va-toroids.jpg Upper left corner.
Goldmund Mods, Improvements, Stability

Aesthetically, the CTC preamp still ranks No1 for me.
 
Old 19th March 2013, 03:46 AM   #36874
wayne is offline wayne  United States
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by john curl View Post
Wayne, I am not attacking the XP-30, but comparing its mass and complexity with the CTC Blowtorch.
I should remind you that there are actually really good reasons to have such material thickness in a preamp. Thicker makes a BETTER shield. Just look it up on the shielding tables. Thicker, from experience is not as susceptible to 'ringing', and it tends to keep air currents contained inside, and not leaking out through 'cracks' or breaks in the surface continuity. IF you are ONLY making it thick to impress your customers, well that works too! '-)
Thank you John as it comes from the real deal. Probably 25 years ago you gave advice to me at a NS seminar on audio design and Audio Amateur. It's been downhill since or is it uphill. Keep sharing.
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Old 19th March 2013, 03:47 AM   #36875
wayne is offline wayne  United States
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John Curl's Blowtorch preamplifier part II
Sorry wrong quote but thanks John.
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Old 19th March 2013, 04:44 AM   #36876
john curl is offline john curl  United States
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Wayne, I really like the way you attached your panels together.
A few years ago, a friend, a mechanical engineer, designed a box for us, but wound up costing plenty and the machinist said that it took over 50 different operations and why not just 'hog it out'? And that is where we have left it, until now.
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Old 19th March 2013, 05:07 AM   #36877
Steve Eddy is offline Steve Eddy  United States
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Originally Posted by john curl View Post
Wayne, I really like the way you attached your panels together.
A few years ago, a friend, a mechanical engineer, designed a box for us, but wound up costing plenty and the machinist said that it took over 50 different operations and why not just 'hog it out'? And that is where we have left it, until now.
Don't know just how he designed it, but I used a similar slab construction for my preamp back in the late 80's. It was certainly more costly than a sheet metal chassis, but it was far less costly than hogging out of solid billet.

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Old 19th March 2013, 07:25 AM   #36878
Kindhornman is offline Kindhornman  United States
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Jacco,
I was just kidding but it is a way to achieve a pretty finish if that is what you are really after and not the electrical and mechanical properties that is really the end result wanted. I have seen some really nice cast aluminum but the ideal in audiophile finish has just been a very high polish or even a brushed and plain or anodized finish for a long time. Some like hard anodized clear finishes and some would just leave a bare aluminum finish. Just wasting all the aluminum you have to in-order to hog out a solid billet is something you would do in a cost no object design. Now as for an air leak I don't see why you would ever care about a thermal leak, isn't that something that would be an advantage in any electronics to remove heat? What is a finned aluminum heats sinks purpose besides doing that in every other instance?
 
Old 19th March 2013, 08:30 AM   #36879
Esperado is offline Esperado  France
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Nelson's not in this thread waving his hands and thumping his chest over his chassis designs.
Neither he pretend abuse of expensive metal brings anything to audio quality.
I consider this kind of pure marketing waste of material and energy, this abuse of resources in a breathless world, as morally unacceptable.
The world is walking on its head, like when people are changing their cell phones every six months for pure fashion purposes.
 
Old 19th March 2013, 08:49 AM   #36880
coresta is offline coresta  France
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The world is walking on its head, like when people are changing their cell phones every six months for pure fashion purposes.
Mhmmmm, la faute à qui ?!
Anyway , as previously said, any luxury good needs luxury packaging , for shoes, clocks, and even jewelry ....
 

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