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References: <4510637253.20151114190626@chriswilson.tv>
Date: Sat, 14 Nov 2015 19:23:47 +0000
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From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Valve LF amps and tank coil size / voltage rating?
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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.
>
>
>
> --
>
>
> Best regards,
>  Chris  2E0ILY                           mailto:chris@chriswilson.tv
>
>
>

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<div dir=3D"ltr"><div>I&#39;ll say it again</div>V =3D 4.44.F.N.A.B =C2=A0(=
all SI units)<div><br></div><div>THAT is how you size ferrite cores.=C2=A0 =
It tells you more or less everything you need to know to make ferrite trans=
formers.=C2=A0 Keep B to less than 0.1 at these frequencies</div><div><br><=
/div><div>But.. why would you want to use valves?</div><div>Expensive, unre=
liable, high voltages...</div><div><br></div><div>&#39;jnt<br><div><br></di=
v></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On 14 Nov=
ember 2015 at 19:06, Chris Wilson <span dir=3D"ltr">&lt;<a href=3D"mailto:c=
hris@chriswilson.tv" target=3D"_blank">chris@chriswilson.tv</a>&gt;</span> =
wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex">14 November 2015<br>
<br>
<br>
If you built a decent power valve LF amp what is the realistic voltage<br>
limit to ferrite cored tank circuits? In other words, what plate<br>
voltage / current is the limit for say a ferrite cored toroidal coil<br>
before you have to move on to an air cored (very large?) tank coil?<br>
Anyone have any links to the limiting figures? All the highish power<br>
valved LF amps I can find are commercial and size was probably not an<br>
issue, but MAYBE they were pre ferrite toroids, I am not sure when<br>
they came into usage. Thanks.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
<br>
--<br>
<br>
<br>
Best regards,<br>
=C2=A0Chris=C2=A0 2E0ILY=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mailto:<a href=3D"mailto:ch=
ris@chriswilson.tv">chris@chriswilson.tv</a><br>
<br>
<br>
</font></span></blockquote></div><br></div></div>

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