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<p>Dick Rollema wrote:
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<b>To All from PA0SE</b> <b>Many
thanks to those who gave me their views on the matter of FETs versus bipolar
transistors in LF transmitters.</b> <b>I now understand why at unpredictable
moments one of the four HEXFETs IRF520 in my TX fails, though they are
operated within their maximum ratings. It must be the class B operation
for which the FETs were not designed.</b> <b>I will turn down the
supply voltage down to 30V again at which I started on LF. The FETs seemed
to accept that over prolonged transmission times.</b> <b>73, Dick,
PA0SE</b></blockquote>
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