I would not recommend toroids above 40M and even there its iffy at high
power. And of course use one per band.
My Alpha 76PA ran strictly in a Carribean contest station before I got it
and the tank circuit stll looks new.
Carl
KM1H
----- Original Message -----
From: "Roy" <royanjoy@ncn.net>
To: <Amps@contesting.com>
Sent: Saturday, March 24, 2012 4:17 PM
Subject: Re: [Amps] Guidelines.....toroids for tank ckts
> 'T'was asked,
>
> "I'm looking at alternatives to rebuild a tank circuit in a 1.5kw HF amp.
> I'm interested in using toroids rather than air-core coils and with that,
> a
> different (non-tapped, separate coil for each band) switching scheme. I've
> seen (2" T-200 series) toroid cores used in 80/160 sections of Alpha 76
> series and have heard they're used elsewhere, but I don't know what I
> should
> consider in a homebrew application, other than dielectric tape to prevent
> arcing through the core. Does anyone have any references or other info I
> could look up?"
>
> Tks,
>
> 73 Dave WB0GAZ
>
> Hi Dave,
>
> I use a 4" by 1 1/4" T-400 powered iron core as L-1 in my 160-meter
> Pi-L tank along with a stacked pair of two T-200 as L-2. Runs cool at
> 1500
> watts CW all day. I use the HV glass tape recommended by Amidon and others
> to wrap the cores with.
>
> 73, Roy K6XK Iowa
>
>
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