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Both stereo and mono 3e amplifier boards are back in stock at AliExpress. They are selling out fast.

I got this on Saturday. It runs on 200 volts but since I have two power receptacles next to each other on different voltage legs, I can get the voltage by using both hots. It's a single ended MA5332MS Infineon chip. I got it for 58 bucks. It also has DC outputs for a preamp, etc...