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A tall thin piggy, or a short squat piggy?



Hi!

I've been thinking of building my first piggy powered TC. I've found
what appears to be a good source that offers a wide varity of pigs. 

My question is, which one to choose? 

They have 7.2 KV and 19.9 KV?
I know that it would be alot more difficult (i.e. costly) to make a 19.9
KV MMC than it would to make a 7.2 KV one. (I'm planning on going with
an MMC) But is 7.2 KV addiquite? With equal KVA ratings, would 19.9 KV
output out perform 7.2 KV? Would the difference in performance be enough
to justify the difficulties involved with the higher voltage?

They have 10KVA($95), 15KVA($135), & 25KVA($208)?
Would I be better off buying a smaller one, and working with that until
I wanted to go bigger, or buy a large one now and ballast the h*** out
of it till I build a *really* large TC?

I'm having trouble seeing the forest for the trees here :)

Paul

BTW, the source is Austin International
http://www.austinintl-dot-com/Transformers-Power.html