1500 watts
4kV, 625mA
Single 8877 at around 4000 ohms plate impedance in AB2.
Tnx,
Jim N7CXI
Sent from mobile wireless
-------- Original message --------
From: Jim W7RY <w7ry@centurytel.net>
Date: 10/20/2013 6:31 AM (GMT-08:00)
To: amps@contesting.com
Subject: Re: [Amps] 200-ohm tank and "un-un" in HF amp design?
What kind of power? What plate voltage and current on the tube?
73
Jim W7RY
On 10/20/2013 12:51 AM, Jim Barber wrote:
> Assuming adequate core/wire sizing and airflow, can anyone think of a
> solid reason *not* to design a legal-limit HF amp output tank for 200
> ohms, then use a 4:1 "un-un" transformer to step it down to 50?
>
> I'm curious because doing so would bring the loading cap requirement
> for a 4000-ohm plate impedance down to under 1000pF at 1.8 mHz, which
> can be done with a large air variable alone.
>
> Note: Yes, I know it *has* been done already, but I'm asking for
> opinions as to whether you think it should be.
>
> Thanks and 73,
> Jim N7CXI
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>
>
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