by Eeyore <rabbitsfriendsandrelations@[EMAIL PROTECTED]
>
Apr 23, 2008 at 09:58 AM
Iain Churches wrote:
> "keithr" <keithr@[EMAIL PROTECTED]
> wrote
> > "Iain Churches" <IainNG@[EMAIL PROTECTED]
> wrote
> >>
> >> This whole idea of the usefulness of current regulation
> >> came to me when I was running a prototype amp
> >> from a bench power supply, and noticed the huge
> >> current drawn by the cold heaters.
> >>
> > Same as any hot piece of wire, it is the reason that incandescent
light
> > globes blow at switch on 99% of the time.
> >
> > If you feel that this is im****tant, then (assuming parallel feed) you
> > either need a current limiter for each tube or a single voltage
regulator
> > that ramps up the voltage over a second or two at switch on.
>
> Hi Keith. I am not sure it is *that* im****tant. But I have some very
> good but fragile Tesla KT88s which I would like to give the best
> possible chance.
Is there any evidence that the heaters are especially vulnerable ?
I suspect the simplest way to go is just to ramp the heater voltage rather
than
limit the current actually. It'll be simpler to make and have a lower
overhead.
Graham
