[R-390] RE 3TF7

[Richard M. MC Clung]

The reference to the ballast failures in the R-392 that I
made earlier should actually reference to the similar series
filament circuit of the PTO / BFO in the R-392. The is, of
course, no ballast in series with these filaments. But they
will open due to voltage spikes caused when the primary DC
power is running over 28VDC and the RCVR is powered up or
when the vehicle is started to charge batteries or when
switching from vehicular to generator power. 
Sorry for any confusion. It was my age addled brain causing it.
RICH  WA6KNW