by "Iain Churches" <IainNG@[EMAIL PROTECTED]
>
Apr 23, 2008 at 08:40 PM
"Eeyore" <rabbitsfriendsandrelations@[EMAIL PROTECTED]
> wrote in message
news:480EFA3D.CD27BC9F@[EMAIL PROTECTED]
>
>
> 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
>
