Gents:
I asked a former co-worker (WA5LFY) how our "big" rigs were shut down;
he was still working on them after I left the company. Here is his reply:
> The screen voltage needs to come down first, with the drive at the same
> time.
> Then the high voltage comes down. That prevents high screen current
> which would
> occur if the high voltage is removed first, leaving the screen to look
> like an "anode".
> With drive, screen, and HV removed, the bias supply can be removed, and
> filament
> ramp-down can occur. After all of that, the cooling can be removed after
> a brief
> cool-down period (I used about 3 minutes to remove any residual heat).
> All
> together, it takes about 10 to 15 minutes on the 500kW.
I think that response would be of interest to the group.
- Jim W4ENE
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