[Amps] Copper Pi tank coil oxidisation

[Richard]

>Hi
>
>I'm in the commissioning and measurement stages of my homebrew 
>4CX1000A amp project (1600W out now and looking good).
>
>A couple of weeks have passed by since I wound the Pi tank coils
>using 5mm Cu tubing. Since then the copper has gone from shiny
>to dull brown by oxidation.
>
>Does this matter very much? I guess the RF skin resistance won't 
>be affected very much to affect HF efficiency.
>
€  not much but to prevent Cu O from forming, polish the tubing with fine 
steel wool and coat with gloss urethane varnish.

>Are there any recommendations for coating Cu tube to keep it 
>shiny and is it worth it (for more than cosmetic value)? 
>
>73 Mark G4AXX
>
>
>
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-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
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