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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: "Carl" <>
Date: Sun, 11 Jun 2017 18:16:59 -0400
List-post: <>
With Teflon insulated wire and Scotch 27 tape between windings probably 4-5KV.
A Hi-Pot tester is great for such things.


----- Original Message ----- From: "Chris Wilson" <>
To: <>
Sent: Sunday, June 11, 2017 4:43 PM
Subject: Re: [Amps] Ferrite Core for 160M PI Output ?

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
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.


Best regards,

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