Hallo, looking for AD633 to a reasonable price. Ordered a few in China/ALI-Express in SOP-8 for 3€ each. Same as others I tested last year; don't work and drive hot after a few seconds. My test circuit is fine and works with AD633 bought for 10€ each. Need it for my Frequency-Shifter. Any idea? willi willi sauter KlangbauKoeln