The plot does not address power. Only peak voltage across the BS170s. However the 160m has higher power than the other bands.
You can see that 160m and 80m exceed the 60V ratings of BS170 and are marginal on 60m and 40m.
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When evaluating the effects of ATU switching (used my Elecraft T1) I was able to capture ~100v very fast spikes.? Breakdown from these spikes may cause cumulative damage and ultimately total failure.
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