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3 Amps in the eliminator (assuming it is the supply output for the A output) means means it can only supply 3 Amps to your radios heaters. If your radio draws less than 3 amps it will still work, but if your radio needs more than 3 Amps for it's heaters that supply can NOT be used (over current protection will kick in or the voltage will sag like your battery or the eliminator will burn out....I think it is the former of the three in the case of the ARBEIII).
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