[Top] [All Lists]

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

Subject: Re: [Amps] Ferrite Core for 160M PI Output ?
From: Chris Wilson <>
Reply-to: Chris Wilson <>
Date: Sun, 11 Jun 2017 21:43:38 +0100
List-post: <>

Hello Carl,

I  am  beginning  to  build  an LF amp using a GS35B tube, what do you
reckon the HV limit is for a Pi coil wound on a toroid? At 136 kHz air
wound coils start to get pretty big nd bulky.... Thanks

On Sunday, June 11, 2017,  you wrote:

> ** The T225-2B is sometimes hard to source so a pair of the A version is
> equivalent. A pair of the more common T200-2A or 2B is what was used in most
> amps.
> Ive run two 200-2A's on 160 for about 30 years in a modified NCL-2000 
> without problems at 1200W including AM.
> Dont forget to wrap each one with a layer of Scotch 27 HV tape and then wrap
> the stack before winding. I also used #14 stranded Teflon wire as that was
> what I found on a big reel at a scrap dealer.

> Carl 

Best regards,

Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>