>
>rich wrote (>), and i offer my unsolicited thoughts, (for what
>they're worth)
>
>> At 6kV, for a ZSAC of 0.5A per anode, the grid bias requirement for a
>> 3CX2500F3 (Mu=22) is roughly -220V. If the -220V bias supply is
>> connected between the filament transformer CT (cathode) and
>> chassis-ground, the grid flange can be directly grounded.
>
>the thing i don't like about this sort of scheme is that the formerly
>wimpy (grid) bias supply now must become a pretty big power supply
>which will handle the full cathode current.
- Only grid current flows between the grounded-grid and the ungrounded
cathode.
...snip...
>and my comments are meant to apply to legal - limit amplifiers for
>the amateur bands. others are apparently building amps for other
>applications.
>
The U.S. limit is currently1500W pep. Other countries represented here
have different limits. The U.S. limit is not a law. It is an arbitrary
rule set by the FCC. IMO, the FCC could not care less how much power
amateur radio operators use---provided that they do not cause
interference.
Rich---
R. L. Measures, 805-386-3734, AG6K
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