Thanks.
You've reminded me that there is a blower speed selector in the cabinet and I
should definitely make sure that it's running at the max for RTTY contests.
73
Al
AB2ZY
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Roger (sub1)
Sent: Wednesday, April 06, 2011 6:23 PM
To: amps@contesting.com
Subject: Re: [Amps] Alpha vs Henry
On 4/6/2011 5:05 PM, Al Kozakiewicz wrote:
> Can anyone tell me how much power an AL-1500 is rated to produce at a 100%
> duty cycle?
>
> During RTTY contests and outputting about 1000 watts, the tube side of the
> cabinet gets mighty warm.
It should. Running 100% duty cycle and 1500 watts out at 60% efficiency means
you are dissipating 1000 watts. That is a LOT of heat. The temp of the exhaust
air depends on how much air (CFM @ however many inches of
H20) the fan can push. The 8877 is a relatively small tube for its ratings,
but it has a fairly efficient radiator. OTOH that means a blower that can
produce a fair amount of back pressure is required to get full output from the
tube.
As a comparison, when I had an all electric house I heated the basement and ham
shack with 4400 watt space heaters mounted in the walls. In the dead of winter
it only took a few minutes to heat the 13 X 21' den to about 70 degrees. After
that the heater would only kick on a few times for only a few minutes per hour.
That means your amp running under these conditions puts out enough heat to
require opening the den door to keep a reasonable temp. IOW you could heat a
good sized room with that amp on RTTY.
> The power supply side seems cool - but then, that's with the cover on. I
> don't know how hot is too hot and it would be useful to know at least how
> much continuous power the supply is rated for.
If you were running large glass tubes that depend on radiation that cabinet
would be too hot to touch.
73
Roger (K8RI)
> Tube cooling is probably another issue...
>
> Al
> AB2ZY
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