<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I have used heat-conducting adhesive in the past for glueing a sensor + heater block + power resistor together. Could also be used for glueing an expo-pair and/or PTC. Something like this for example: <a href="https://nl.farnell.com/mg-chemicals/9460tc-3ml/white-conductive-epoxy-adhesive/dp/3805506" class="">https://nl.farnell.com/mg-chemicals/9460tc-3ml/white-conductive-epoxy-adhesive/dp/3805506</a> or <a href="https://nl.farnell.com/mg-chemicals/8329tcs-6ml/adhesive-2part-epoxy-syringe-6ml/dp/2811937" class="">https://nl.farnell.com/mg-chemicals/8329tcs-6ml/adhesive-2part-epoxy-syringe-6ml/dp/2811937</a><div class=""><div class=""><br class=""></div><div class="">Ben</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 11 Oct 2022, at 15:37, Matthew Skala 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="">On Tue, 11 Oct 2022, Neil Harper via Synth-diy wrote:<br class=""><br class=""><blockquote type="cite" class="">just wondering if anybody thinks it's worth encasing an exponential pair<br class="">for stability. while this is in my modular case, there must be some heat<br class="">currents moving around from the other stuff that share the same space.<br class=""><br class="">Maybe a dab of hot-glue-gun (hot snot), or a silicone or something?<br class=""></blockquote><br class="">I put two TO-92 transistors face to face, with a cable tie to hold them<br class="">together tightly, and I usually also add a dab of general-purpose plastic<br class="">glue on top to keep the cable tie from sliding off. I don't know if<br class="">that's absolutely optimal, but I think it's good enough for the VCFs in<br class="">which I use it.<br class=""><br class="">The next meaningful level up would be having the transistors on the same<br class="">die; and the level after that would be a temperature-controlled oven. I<br class="">don't think just insulating or shielding them without those measures would<br class="">make much difference - stuff like self-heating effects will be bigger than<br class="">air currents in most cases, given that you're already using a pair of<br class="">transistors. Having two transistors means anything that affects both of<br class="">them, like general ambient temperature variation, should already be at<br class="">least partially compensated.<br class=""><br class="">-- <br class="">Matthew Skala<br class="">North Coast Synthesis Ltd.<br class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class="">http://synth-diy.org/mailman/listinfo/synth-diy<br class="">Selling or trading? Use marketplace@synth-diy.org<br class=""></div></div></blockquote></div><br class=""></div></div></body></html>