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Old 14th December 2012, 06:58 PM   #31
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I also think you've done a great job with this amplifier. According to the Dupont website, this material thermo forms at 150 C (300F). I hope you don't run into deformation problems from the tube heat with long term operation.
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Old 14th December 2012, 07:05 PM   #32
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Originally Posted by HollowState View Post
I also think you've done a great job with this amplifier. According to the Dupont website, this material thermo forms at 150 C (300F). I hope you don't run into deformation problems from the tube heat with long term operation.
Hi!
After assembling the parts and igniting the tubes, I realized that after 3 hours of continuous operation, they run much cooler inside the chassis than laying on the bench. The heat sinks and the passive ventilation channels really do a lot of work there... This was a bit expected but not to this degree, as the heatsinks are at least 15 deg cooler. You touch them and you just feel they're warm, not even hot! Thermal stress is subminimal and the amp runs unexpectedly cool, of course this is welcomed. Transformers run cool as well, being either HV or filament.
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Old 14th December 2012, 07:06 PM   #33
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very nice. an impressive handcrafted piece of equipment. bravo! if I were you I'd paint in different bright colors the transformers covers just like a picture by Mondrian.

Click the image to open in full size.


question: how are you lighting the tubes? AC? or DC?
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Old 14th December 2012, 07:09 PM   #34
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very nice. an impressive handcrafted piece of equipment. bravo! if I were you I'd paint in different bright colors the transformers covers just like a picture by Mondrian.

question: how are you lighting the tubes? AC? or DC?
Nice pic! Maybe for the next project.
Tubes are all DC heated.
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Old 14th December 2012, 07:38 PM   #35
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Originally Posted by petavgeris
Anyway, there is almost nothing inside, only 3 heat sinks for tube rectification diodes and 3 caps for filament supplies, one per tube. There are also 3 regulators inside, giving power to the filaments. This is it.

Peter.
Love it. Absolutely love it...
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Old 14th December 2012, 08:31 PM   #36
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Killing machine. It needs dense robust cage around it.

Edit: or, at least around this tubes: Click the image to open in full size.
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Old 14th December 2012, 08:39 PM   #37
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Lovely. Bu t I'd like to see the Corian lined with mu-metal. I've worked with Avonite a lot which is the same solid acrylic as Corain but not from DuPont and they sell Avonite to anyone. Drills & taps nicely. Invisible seams. Sands & polishes to a nice finish.
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Old 14th December 2012, 08:58 PM   #38
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Originally Posted by Wavebourn View Post
Killing machine. It needs dense robust cage around it.

Edit: or, at least around this tubes:
The tube caps are still missing, waiting for them!
Why use a cage around it? Afraid of being killed of electricity? Not a chance!
If you want to commit suicide, there still exist other alternative ways :-)
And much better! And faster of course!
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Old 14th December 2012, 09:04 PM   #39
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no children I guess
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Old 14th December 2012, 10:19 PM   #40
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or pets...

Consider some tempered glass to protect the hands from the mercury rectifiers??

Ceramic plate caps are insufficient, better than bare metal, but insufficient, imo.

also watch the temp inside the xfmr cans... best to provide some cooling paths from below at minimum...

_-_-bear

Yes, corian and other solid surface materials finish up very nicely.
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