[NJARC] What 'load' resistor in place of the tubes?

[Al Klase]

It's like horse shoes or hand grenades.  All you need to do is come 
close. - Al

On 3/19/2013 9:06 AM, sgt88 at atlanticbb.net wrote:
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> I'm planning on making my battery eliminator - power supply.
>
> In the breadboard stage...I'd like to use load resistor(s) in place of 
> the five 201's and 301's in my Stewart Warner 305...so as not to 
> damage them when/if I have to make circuit adjustments to get the "6" 
> (really 5 actual volt), 45 & 90 VDC set up.
>
> From what I see, the tube Ip is 3 ma...the filament is 250 ma...making 
> 5 x 3 ma = 15 ma total Ip....5 x 250 ma = 1.25 A total filament current
>
> Only one tube gets 45 VDC
>
> Thus:
> 45 VDC needs 45/0.003 = 15k ohms say 1/2 watt
> 90 VDC needs 90/0.012 =  7.5k ohms  say 2 watt
> 5   VDC needs = 5/1.25 = 4 ohms  say 10 watt
>
> Would these resistors do the job??
>
> Steve T.
>
>
>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/