Maybe it did because Ray Cronin and Pat Stein were partners in Command Tech
years ago so perhaps that is true. Not 100% sure though.
Didn’t the QRO 2500 have this format?
-----Original Message-----
From: Jeff Blaine <keepwalking188@yahoo.com>
To: w7ry <w7ry@centurytel.net>; amps <amps@contesting.com>
Sent: Sun, Oct 20, 2013 10:28 am
Subject: Re: [Amps] 200-ohm tank and "un-un" in HF amp design?
Didn’t the QRO 2500 have this format?
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: Jim W7RY
Sent: Sunday, October 20, 2013 8:31 AM
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
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
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