Re: LF: Valve LF amps and tank coil size / voltage rating?

[Andy Talbot <andy.g4jnt@gmail.com>]

I'll say it again

V = 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

On 14 November 2015 at 19:06, Chris Wilson <chris@chriswilson.tv> wrote:

14 November 2015


If you built a decent power valve LF amp what is the realistic voltage
limit to ferrite cored tank circuits? In other words, what plate
voltage / current is the limit for say a ferrite cored toroidal coil
before you have to move on to an air cored (very large?) tank coil?
Anyone have any links to the limiting figures? All the highish power
valved LF amps I can find are commercial and size was probably not an
issue, but MAYBE they were pre ferrite toroids, I am not sure when
they came into usage. Thanks.



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Best regards,
 Chris  2E0ILY                           mailto:chris@chriswilson.tv