> #### Notice how he ramps down the fil V....when done for the night .
As I recall, both Collins and Continental included an SCR-based ramped
filament regulator in the majority of their high-power designs. During my
college years, I worked at a station that used this design in a Collins
831-G-1 FM transmitter that delivered 22.5KW TPO. I do recall seeing
filament voltage slowly ramped up/down with the SCR controller. The SCR
controller displaced the need for a mechanical step-start circuit with the
added benefit of better line voltage regulation to the filaments and ability
to ramp down the filament at turn-off.
Paul, W9AC
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