Re: Secondary Material, Performance and Price

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>


Acrylic is slightly hygroscopic --- we discovered 
this measuring small leakage currents on VDGRF 
generators.  PVC, coated with McMaster's spray 
insulation is a better choice.  Also, don't use 
schedule 80 --- sched. 40 works fine and produces 
a much lighter sec coil.  Home Depot carries the 
sched. 40 as do most plumbing suppliers.

Dr. Resonance

Yesterday I naively went out to home depot to buy a
chunk of 8" schedule 80 PVC for a secondary coil.

I never considered that they wouldn't carry it.  When
I go home I did some searching and found that
Mcmaster.com sells it in 5' lengths for $89.  Mcmaster
also sells 8" Cast acrylic tubes for $192 which
doesn't seem all that much more considering the good
characteristics I've heard about acrylic (doesn't trap
moisture, higher Q, etc.)

So my question is, how much SHOULD I expect to pay for
a PVC pipe (I suspect Mcmaster is high) and would it
be worth the extra $$$ just to go forward with the
acrylic?

Thanks,

Curt.




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