Delighted that you found the problem. Interesting that both drains showed an AC voltage even though one device was effectively shorted. ?That is surprising to me.
Wish you the best
Gordon kx4z?
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On Mar 1, 2025, at 06:38, HA3HZ via groups.io <gyula@...> wrote:
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Wojtek,
Buy 10 pieces so that you can choose the two with almost the same opening voltage.
They may be the same in shipping, but there is still a difference between them.
You can install them without Aluminum nitride with the old mica, and use some kind of fan to cool the heat sink from the back.
Read another message where I wrote how I use the v2.
You can easily replace the AlN ceramic later if you look at which screw you need to unscrew to remove the heat sink.
Read and do the Bias adjustment as described here (you can also find the article on sbitx.net).
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It is important to do the adjustment with a 2A current limit!
--
Gyula HA3HZ
