Re: Filament voltages

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Alexander Rice by way of Terry Fritz <twftesla-at-qwest-dot-net>" <alex-at-rices.myip-dot-org>

06/05/2002 18:58:21, "Tesla list" 
<tesla-at-pupman-dot-com> wrote:

>Original poster: "davep by way of Terry Fritz 
<twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Hi Dave

>> This would be a loaded 10v-at-40amp+ so 400w x 
4 + 1600 w x 1.414 = 2265,
>
>
>	Whence cometh the 
1.414----------------------------^^^^^
>	?
>
>	Those are all AC quantities, implicitly 
RMS
>
>	already?

i agree here - my thought would be that you 
need (4*10*10){resistive load of the four 
filaments} + (4*tube power rating)
>
>
>> so a 3kw fil trans will provide a good 
transformer.
>
>
>	I'm in favour of over design, but 1600W 
is 1600W,
>	I think....

my understnding is that since the filament 
provides the electrons by thermionic emission 
then the power that is being drawn from the 
tubes mostly comes from the plate, the 
accelerating voltage is applied to the plate 
and the control voltage to the screen. So inb 
this case you need more than just the apparent 
power for the resistive load of the fillament
>
>	best
>	dwp
Regards

Alex