[AMPS] floating a filament transformer

[Phil Clements]

> 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.
>

The wire is insulated with an enamel coating.

There is nothing magic about the ferrite rod.   A torroid will also 
work fine.
Henry uses torroids on some of its models where space under the 
chassis is at a premium.

(((73)))
Phil, K5PC