True, BUT a pair of 3-500's require less air than a single 3-1000Z assuming
the use of the Eimac plastic sockets and the same RF output. And, the pair
of 3-500Z can use axial air flow and no chimney at the legal limit.
Carl
KM1H
----- Original Message -----
From: "Gary Schafer" <garyschafer@comcast.net>
To: <dezrat1242@yahoo.com>; <amps@contesting.com>
Sent: Saturday, December 05, 2009 11:04 AM
Subject: Re: [Amps] Advice
There is no free lunch. While it may seem like you could get by with less
air flow it doesn't follow.
A pair of tubes will require twice the air flow at the same back pressure as
a single tube. Tubes being the same of course.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Bill, W6WRT
> Sent: Saturday, December 05, 2009 1:59 AM
> To: amps@contesting.com
> Subject: Re: [Amps] Advice
>
> ORIGINAL MESSAGE:
>
> On Fri, 4 Dec 2009 17:07:47 +0000 (UTC), Paul Decker <kg7hf@comcast.net>
> wrote:
>
> >One possible advantage of two tubes over a single tube is the blower
> and airflow. Sometimes using two smaller tubes will require less
> airflow and have less backpressure than a single tube.
>
> REPLY:
>
> Excellent point. It is a well known law of geometry that multiple small
> objects
> have larger surface area than a single object of the same total volume.
> It
> stands to reason that two smaller tubes will cool better than one large
> one,
> other factors being equal. Thanks.
>
> 73, Bill W6WRT
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