Bitex40 power output.

Soundararajan Ra.
 

Dear
In my bitx40 during testing upto three qso power output about 7 watt .Then suddenly no output ,when i measure drain current of IRF 510 on mic disconnect conditions it was 90ma and with speaking current about 110 ma.
I thought IRF may qrt .
I changed new irf 510 (ST make) adjusted rvi1preset in mic out condion drain current was 70 ma at maximum rvi1 position and when i speak current s only 120 ma .my sx200 swr/power meter at 20w range reading is 3to4watt.
is it correct or what is to be done to raise the power.
Your suggestions welcome.
Thanks in advance.
73s
Soundar
VU2RJW.

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