Beware
It sounds like an Electric chair you are
Building ------one zap and u are gone!!!
G3kev
Sent from my iPhone
On 14 Nov 2015, at 20:00, Chris Wilson <[email protected]> wrote:
> Hello Andy,
>
> Saturday, November 14, 2015
>
>
> OK, but what about wire breakdown voltages? In all the big air cored
> LF tanks I have seen the windings are well spaced on ceramic, or
> Paxolin type grooved formers, how do I know a close wound toroidal
> coil won't break down?
>
>
> I have built a few HV supplies using decent industrial quality iron
> cored transformers, the biggest is 5kV at 1.5 Amps, which can also be
> fed from a 40 Amp Variac, to drop the primary down. I use that in my
> workshop for running a glue drying machine.
>
> I was also gifted some NOS ceramic triodes, some US, some Russian, and
> would consider having a bash at a valved LF amp, just "because" :) I
> have to say my limited experience of ceramic triodes has shown no
> unreliability, in fact a zero failure rate so long as they are
> gettered before use, if they have lain dormant for years.
>
> I do have a reasonable collection of failed FET's though :) In
> fairness user error was the demise of most of them.
>
>
> Thanks Andy.
>
>
>> I'll say it againV = 4.44.F.N.A.B (all SI units)
>
>
>> THAT is how you size ferrite cores. It tells you more or less
>> everything you need to know to make ferrite transformers. Keep B to
>> less than 0.1 at these frequencies
>
>
>> But.. why would you want to use valves?
>> Expensive, unreliable, high voltages...
>
>
>> 'jnt
>
>
>
>
>
>
>
>
> --
> Best regards,
> Chris 2E0ILY mailto:[email protected]
>
>
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