[Amps] Ferrite Core for 160M PI Output ?

[Carl]

With Teflon insulated wire and Scotch 27 tape between windings probably 
4-5KV.
A Hi-Pot tester is great for such things.

Carl

----- Original Message ----- 
From: "Chris Wilson" <chris at chriswilson.tv>
To: <amps at contesting.com>
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
>> 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,
> Chris                            mailto:chris at chriswilson.tv
>
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