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

["Carl" <km1h@jeremy.qozzy.com>]

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

Carl


----- Original Message ----- 
From: "Peter Voelpel" <dj7ww@t-online.de>
To: "'Chris Wilson'" <chris@chriswilson.tv>; <amps@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@contesting.com] On Behalf Of Carl
> Sent: Montag, 12. Juni 2017 00:17
> To: Chris Wilson; amps@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@chriswilson.tv>
> To: <amps@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@chriswilson.tv
> >
> > _______________________________________________
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