Hi Doug,
?
I agree with Nate that the symptom you describe is not normal.? My guess is that the BS170s are getting warm.? The resistance of a MOSFET increases as the temperature rises, reducing the power output.? The best way to verify this is to open the lid of the QDX and use canned air to cool the BS170s.? If the power increases, then heat is the cause.
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73
Evan
AC9TU
