[Amps] PS Theory ?

[rlm]

>
>Please excuse the dumb question...  I'm trying to figure out how to
>determine the power handling capability of transformers (I did take a
>quick look through the ARRL Handbook last night)...
>
>Questions: 
>
>How can you determine the power handling capability of a transformer???
>
€    primarily by measuring the resistance of the secondary winding.  
Look in "Amplifiers" on my Web site for some rule of thumb formulas.

>For example, the secondary on the transformer in my Heath SB-201 is
>rated at 800 VAC at 0.5 amps...  I would think this transformer would
>only be good for about 400 watts of power (800 x 0.5) but it seems that
>if you feed this secondary into a full-wave bridge rectifier and
>capacitors you would get about 1,000 volts and 0.5 amps under load (500
>watts), or feed it into a voltage doubler circuit, like that in the
>SB-201, and you get about 2,000 vdc at 0.5 amps under load (1,000
>watts)...
>
>I'm confused...  What am I missing???  

€  Duty-cycle considerations.  For SSB, a 600W-CCS rated transformer will 
make c. 1500w pep RF-output.