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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