[GreenKeys] Loop power supplies

[drlegendre .]

@Jeff

Ok.. so by using a tube as the pass element, they're eliminating the
inductive rise time of the high-value rheostat(s) which would otherwise be
in series with the output current. Is this the whole reason for using this
supply?

What then about the inductance of the meter winding? Of no consequence?

On Sun, Mar 4, 2018 at 9:28 PM, Jeffrey Angus <jdangus at att.net> wrote:

> On 3/4/18 9:01 PM, drlegendre . wrote:
>
>> IOW it's not a constant-current supply, but rather a high
>> voltage (~300V) current-adjustable supply.
>>
> That is correct.
>
>> Ultimately, its behavior isn't much different than that of a
>> simple passive rheostat - nor am I exactly sure what advantage
>> it provides over the former.
>>
> Actually there is.
> This difference is small, but using a vacuum tube as a variable
> resistor allows the rise time of the current through the selector
> magnet rise a little bit faster.
>
>
>
>
>
> --
> "I am a river to my people."
> Jeff-1.0
> WA6FWI
> www.foxsmercantile.com
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