>As Rich says, you need a bigger filament to get more output. The same
>applies to the 4-250A and the 4-400A: they have the same 5v 14.1 Amp
>filament ratings. Quite probably the same filament design was used for
>the 3-400Z etc, as the ratings are the same (for the filament). I've never
>cracked a 4-250 open to have a look see.
>
The filaments in all of the above are virtually identical, Peter -- so
their peak emissiive ability is virtually identical -- i.e., 1.2 amperes
peak in linear service.
"There is no 'free lunch'." Grandfather Measures.
cheers
Rich---
R. L. Measures, 805-386-3734, AG6K
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