Can you use a 16vac 4A power supply to power a 16vac 1000ma tube amp?

Yes, you can use a 16VAC 4A power supply to power a 16VAC 1000mA tube amp. The power supply's current rating (4A) exceeds the amp's requirement (1A), which is safe and sufficient. Just ensure that the voltage is stable and matches the amp's specifications to avoid damage.