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Re: [Amps] Ferrite Core for 160M PI Output ?

To: "'Chris Wilson'" <>, <>
Subject: Re: [Amps] Ferrite Core for 160M PI Output ?
From: "Peter Voelpel" <>
Date: Tue, 13 Jun 2017 17:28:03 +0200
List-post: <>
Hi Chris,

The builder and owner of the amp is sk, so I don´t know if the amp is still
in use.
But when he built it we where in close contact and I suggested the cores to
The material is close to mix 61, their diameter is 120mm and the thickness
is 15mm, he used a stack of three.
The tape wrapping is only necessary to break the very sharp edges of the
cores, they are not as smooth as the Fire-Rite cores.
Electrically it is not necessary, the do not conduct.

The cores are from ex GDR military sources which more or less dried out.
Dirt cheap they were sold on flea markets for 1,-DM each at the beginning.
The last 50 I bought in 2005 were 2.50 Euro each.

-----Original Message-----
From: Amps [] On Behalf Of Chris Wilson

Hello Peter,

Thanks  for  the photos of the LF tube amp, is there any more info on
it  available anywhere? My friend speaks fluent German if it's in that

Just  how  conductive *IS* ferrite anyway, i have never probed it. And
how  much  of an adavatage is there in stcking cores which are totally
flat  on  the  sides which mate together when stacked compared to some
that  have  a  bevelled (radiused) surface? i have some FT240-78 cores
that all came from  FairRite but some are flat, some bevelled....


On Tuesday, June 13, 2017,  you wrote:

> When I use multiple cores I glue them together with two component epoxy
> first and then I insulate and wind them, much easier.

> 73
> Peter

Best regards,

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