Bob...WRT the Titan 425 idle Ip....It sounds like the tubes are not being held
in cutoff when un keyed....The 28 VDC and the bias voltage can be checked
without defeating the interlocks by removing the bottom cover and measuring the
bias voltage at R-15, D-2, Q-1 & Q-7 on the Input Bias Board.... Remember that
the tubes will not receive the normal airflow while the cover is off. A few
minutes will not cause any problems but I wouldn't leave the cover off any
longer than necessary..
Mike AA7WU
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