Where to buy step-down toroidal transformer with electrostatic shield?

[Kuro]

I'm looking for a high quality 50VA toroidal transformer with 6-0-6V output (or 2x0-6V)or 7-0-7V output (or 2x0-7V). I prefer having two primaries of 0-115V each so I can use it in parallel or in series.

Ideally, I'd prefer the transformer having an electrostatic shield b/w primary and secondary with wire from the shield for grounding. This is to avoid noise coupling from primary to secondary.

So far, I only see Nuvotem meeting most of the specs., but I don't see anyone advertising transformers with electrostatic shield.

[jcx]

shielded toroid still has large C between the windings and the shield - so you have the problem of where to gnd the shield

I'd rather have the order of magnitude less C in a split bobbin EI and forgo the shield

[Kuro]

The problem is that I've a space constraint so an EI won't fit. Plus the fact that I don't want excessive heat from an EI.

Is there a way I can measure the capacitance of a toroid?

[ackcheng]

try plitron