In the old Bill Orr Radio Handbooks, he presents a graph of transformer core
weight vs. power capacity for various duty cycles. Admittedly it is an
approximation with a couple of caveats for ICAS service; low breeder
resistor load and cut off bias on the tube during stand by. The graph
discloses that you can get 2 KW from a core weight of 22 pounds if you want
to push it, or 35 pounds if you want to be a more conservative. Although it
does not state explicitly, I assume that the weight of wire is included in
the core weight. The core weight does not include the case or mounting
fixtures.
The statement is made that the data are the results of extensive testing on
typical transformers.
David C. Hallam
KC2JD
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