On Tue, 1 Feb 2011 15:24:41 -0800 (PST), K1TTT wrote:

then there is either something wrong with your components or you have
too much coupling the the surrounding environment... so you really had
a 3 terminal network using the stray capacitance or inductance.

This can be neutralized employing a "Wagner Earth." For inductors,
there is the Modified Owen method.

Basically, problems of this sort have been handled with driven shields
(a variant of the Wagner Earth/Ground). This exactly century-old
topic ( "Wagner Earth") is rarely discussed outside of precision
measurement or very high voltage handling circuits, however.

73's
Richard Clark, KB7QHC