No, the trouble started when I tightened up the thermal straps on the bias transistors and cranked the backplane board down one last time. Then I added in the second row of transistors and had the runaway bias issue. The 4 to 8 fin conversion was just a joke. All I did was mount in the small heat sinks. No trouble there. I did use a thin layer of silicone heat sink thermal grease, but I've been using that stuff for years and don't over apply. Just a thin, even layer. There was the slightest bit of overflow, but it was minimal and cleaned up with 5 minutes and a handful of q-tips.
I'm fairly certain that cranking down the thermal straps was the fatal error. We'll see what happens when I dive back into it. It was too nice in Chicagoland today to be inside. Took the Harley out for a few hours and did some yardwork instead of getting frustrated with the amp.
I'm fairly certain that cranking down the thermal straps was the fatal error. We'll see what happens when I dive back into it. It was too nice in Chicagoland today to be inside. Took the Harley out for a few hours and did some yardwork instead of getting frustrated with the amp.
