Re: [AT_Sprint] ATS-3B Final Replacement and Heat Sink
- On Thu, 15 Sep 2011 13:21:32 -0700, George Carey Fuller KX0R
> Several weeks ago I had to replace the finals in my ATS-3B.[snip]
> I replaced the 2N7000 mosfets with BS170 devices. I also added a small
> copper heat sink. I'm delighted with the results.
> I wrote a detailed account of what I did and posted it here in the Files
> section. Please open up the pdf file ATS-3B Final Replacement and Heat
> Sink if you're interested.
> There are several photos posted here in the Photos section showing the
> heat sink and how it's clamped across the three final mosfets. These
> are the last 4 images in my folder (KX0R).
Very interesting! I would think that the heat sink would give your new
finals enough cooling to be reliable. If you do blow a final, you'll
surely tell us. Thanks for sharing your results with the group! By the
way, the ATS-3B.1 also uses BS170s for finals.
- Rob W7GH