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After I modified the output stage circuit at SBitx v2, I only now had the opportunity to test it in reality.
There were several reasons for this, I didn't have a usable antenna, which is important.
After switching to v3, I tried the device on the air for the first time.
I replaced the AlN insulators when it was first discussed here on the forum.
I also used a very small amount of Arctic Sliver 5 additive on both sides of the ceramic insulator.
This is the weakest link in the heat conduction used here.
I find that in long-term FT8 use, the heatsink on the back is approx. 40 degrees, then the current consumption decreases compared to the start.
So the regulation takes place so that the output power decreases slightly (according to the instrument, about 1W).
I use the device from 12.5V with a current limit of 6.00 Amps.
I replaced the IRFZ24Ns once. Since this is from early production, it ran for some reason during setup.
The point is that so far I am satisfied with the heat conduction, I have made about 50 connections with the freshly made top-fed delta loop antenna.
I scaled it to 7MHz and it has good parameters at 7-14-21 MHz.

I would like to thank Ashar for his persistent work.
The design is well developed for visual and usability reasons.
I didn't take a picture for this topic, but you can find them in another topic.
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Gyula HA3HZ