A lot will depend on the output voltages, but as a general rule of thumb, I like to see a transformer with a VA rating equal to twice the total expected output power. So for 216 VA, you should be able to get 108 watts output, or 54 watts per channel for a stereo amp.
The output voltage and current capability will determine how close you can come to that in the real world.
The output voltage and current capability will determine how close you can come to that in the real world.
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