Tony's,
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The fix Hans put into the SSB firmware to avoid blown finals?
is to periodically give it a rest so the finals can cool down.
If that does help (and my impression from forum reports is that it probably does),
then current can also be a problem.
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Fortunately, the TN0110's can deal with both more voltage and more current than the BS170's.
So if they can transmit clean SSB on the QMX, that's a big win either way.
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Jerry, KE7ER
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On Mon, Mar 24, 2025 at 07:15 PM, Tony Scaminaci wrote:
Over the past year or so, it seems we came to an unofficial conclusion that BS170s were blowing due to high drain voltage as a result of high SWR or exceeding 12VDC at the supply input rather than overheating due to high current. TN0110 has a significantly higher drain voltage advantage over BS170 (100V vs 60V) and if it works well with SSB, I’ll be very happy. Keep us posted on your SSB adventure with TN0110.
