[AMPS] floating a filament transformer

[jsb at digistar.com]

On Thu, 16 Sep 2004, R.Measures wrote:

> the choke for the 3-500Zs would need to be wound with #8 gauge wire.

I have been reading with interest about the filament chokes for 3-500Z,
etc.  In the photos I've seen of projects the filament choke appears to be
bare wires around the ferrite rod.  Am I seeing this correctly?  How does
this not short out and thereby not provide current to heat the filaments?
Or is this wire typically coated with some kind of insulating material.


73 jason N1SU