[Amps] Ferrite Core for 160M PI Output ?

[Carl]

Those are great tubes Peter; I use a pair as AM modulators.

Carl


----- Original Message ----- 
From: "Peter Voelpel" <dj7ww at t-online.de>
To: "'Chris Wilson'" <chris at chriswilson.tv>; <amps at contesting.com>
Sent: Sunday, June 11, 2017 7:10 PM
Subject: Re: [Amps] Ferrite Core for 160M PI Output ?


> Indeed, this pp amp with GU81 runs with 3.5KV on the anodes:
>
> http://www.pbase.com/df3kv/image/86725410/original
>
> 73
> Peter, DJ7WW
>
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Carl
> Sent: Montag, 12. Juni 2017 00:17
> To: Chris Wilson; amps at contesting.com
> Subject: Re: [Amps] Ferrite Core for 160M PI Output ?
>
> 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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>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
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