Bis current fluctuates wildly high, occasionally flashing green about 28 to 30 ma but wildly high and red flag around the value. The 12 volt supply may indicate 12.0 to 12.1 with a slow variation. That's on a cheapo mini meter digital display but mimics the putty indication.
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D502 and C504 look like the only two regulating components in the TX BIAS circuit.?
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73
Karl
KI4ZUQ
Karl