Now... ya made me feel bad. I posted the questions not expecting you to email AE and ask for all that info. It was a rhetorical device... hoping to show the range of performance variables and notions that goes into a design. And calling into question the myopic focus on some very small subset of these expanded parameters.

I'd bee surprised if they answered all of them... and I wouldn't expect them to... they do have a right to treat much of that information as proprietary design information.

Interestingly, you felt comfortable enough to make the purchase decision without having this info. If I may ask... and not putting you on the spot... if this info were deemed to be vital... how did you make a positive purchasing decision? On what basis did you say... hey... I spend my bucks and get a choke from this company?

In the seventeen years of building tranneys... I have never had anyone ask me for the winding capacitance of any transformer we make. And we sell to a host of professional designers who have built scores of products over the years... and to many thousands of diy end users.

Personally I think this whole issue of winding capacitance and leakage L is a tempest in a teapot. And I tried to illustrate this by posting a two part example of how focusing on any one or two parameters could lead to mischief when I put up the examples of transformer A and transformer B.

What I have always found is... the best way to get service or information of this type is to contact the manufacturer privately and ask if this information might be available. Explain to them your need for the info and your use of the info. If they say that it is proprietary... then my sense is always to respect that.

Likewise... even if AE does provide you with some info... please be sure that it's ok with them to release it publicly... if they wish to treat this info as proprietary... that is well within their rights... and, I certainly don't want to do anything (or be demanding of information) that would vitiate that legitimate stance if that is how they would choose to respond.

Though...darn... I am curious as to why they only filled up about half of the lamination stack in those bobbins.

msl