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Old 20th September 2006, 11:50 PM   #1
jarthel is offline jarthel  Australia
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Default why is it that most tube projects uses copper sheetmetal?

well I'm not sure if this is true for all cases most projects I've come across uses copper plates. Is there a technical reason for this?

thank you.
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Old 21st September 2006, 12:00 AM   #2
poobah is offline poobah  United States
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Technically, it's cool looking.
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Old 21st September 2006, 12:20 AM   #3
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I have seen several old amplifiers that appear to have a copper chassis, but it turned out to be copper plated steel. Easy to find with a magnet.

In theory copper has a higher electrical conductivity than steel or aluminum, it can be soldered, and does not conduct magnetic fields. Are these advantages worth the substantial extra cost? That is up to the designer.

And, yes it looks cool.
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Old 21st September 2006, 12:29 AM   #4
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It's also easy to drill, cut, and bend. Polishing out scratches is also easy. However, Morgan Jones warns about using Cu and Al together in "Building Valve Amplifiers". If the two touch, it can cause corrosion (electrolisys, I beleive?)
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Old 21st September 2006, 12:29 AM   #5
poobah is offline poobah  United States
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I 'spose one thing to consider is the need for some type of clear coating to keep it from turning brown and then green. Clear coatings yellow with heat as well.
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Old 21st September 2006, 12:40 AM   #6
phn is offline phn  Sweden
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I hear C37-treated brass has the most natural tone.

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Old 21st September 2006, 12:41 AM   #7
poobah is offline poobah  United States
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NO!!!!

Gold is best!

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Old 21st September 2006, 12:43 AM   #8
jarthel is offline jarthel  Australia
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Quote:
Originally posted by poobah
I 'spose one thing to consider is the need for some type of clear coating to keep it from turning brown and then green. Clear coatings yellow with heat as well.

RS sells a clear lacquer that doesn't yellow (at least that's what the website says )
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Old 21st September 2006, 12:44 AM   #9
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solid molybdenum is best, great workability and a real deep sound dont forget the low price
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Old 21st September 2006, 12:44 AM   #10
rdf is offline rdf  Canada
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Quote:
Originally posted by jaymanaa
It's also easy to drill, cut, and bend.
In my experience copper is one of the nastiest materials to drill and certainly the worst to tap. It's too soft. Looks great though.
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