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Message: <blockquote data-quote="TwentyTrees" data-source="post: 940977" data-attributes="member: 58533">And, from the datasheet on Kubarth's website, I think I've answered my own questions (assuming the garOA10 is the same as the Neumann in these respects):<ul> <li data-xf-list-type="ul">Differential input impedance = 40k...</li> <li data-xf-list-type="ul">So on a mic impedance of 200R, around a 4.5:1 step up on the input transformer seems about as much as I can ask for...</li> <li data-xf-list-type="ul">And given output impedance and current, 50dB into a 150:600 OPT should be very doable.</li> </ul>There's a few ill-informed assumptions going on here (eg that input Z is more a function of topology than the exact transistors used), so I'd be grateful for a steer if I'm wildly off base with any of this. Otherwise: test and learn! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>