<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 28, 2026, at 12:57 PM, Oren Leavitt via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Cool!<br class="">That looks tempting to me. I have a couple of those THAT4301 analog <br class="">engines that I bought some years ago. I was originally intending to <br class="">build a vocoder around THAT4301s but the chips were discontinued.<br class=""></div></div></blockquote></div><div class=""><br class=""></div>What I’d like to have is a simple IN-9/IN-13 driver board that has a CV input and a level knob. Simple. All of the designs I’ve seen are part of a more complex circuit that I’m not about to try to modify. If anyone wants to do it for me I won’t complain. <div class=""><br class=""></div><div class="">I have a small pile of both kinds of tubes that I acquired before that prices went crazy. Sadly, I don’t have the purple IN-9s filled with argon.<div class=""><br class=""></div><div class=""><br class=""><div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Terry Bowman, KA4HJH<br class="">"The Mac Doctor"<br class=""><br class=""><a href="https://www.astarcloseup.com" class="">https://www.astarcloseup.com</a><br class=""><br class="">"Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact."—Carl Sagan, <i class="">Psychology Today</i>, 1996</div></div>
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