Thank you! That helps a lot. The Darlington has variable capacitance - MM: 0pF, 50pF, 100pF, 150pF, 200pF, 250pF, 300pF, 350pF. And they'll set it to whatever I want when it ships. So I could ask them to set it to 100pF, and looks like I'd be good. Thanks again for the excellent answer!