Power Supply for LM1875

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I'm trying to build a stereo amplifier with two LM1875s. My plan is to use a 18-0-18V Transformer but my question is how much VA does the transformer need to be. How much current is required to drive two of these? I looked at the data sheet an saw that the supply current was 100mA and I thought to myself that can't be right, can it?
 
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