Re: Secondaries

>>>> If you know of some more practical resources please let me know. I am
>>>> trying 
>>>> to understand more about these variables as I go along. I'm also 
>>>> looking for building tips and parts resources. A current book of this kind >>>> of thing would
>>>> be great.

The only sources that I have used are the TCBA newsletter, a local electronics
store that deals with surplus/used stuff and a friend in a nearby town 
who can get transformers for $10 when available.