On Wed, 6 Dec 2000 09:48:45 -0600 , Brakob, Hans wrote:
>Just installed a new AL-1200 yesterday.
>The blower is kinda loud, like sitting in the back row of a DC-9 with full
>reverse thrusters.
>I notice the blower has wiring options for 4 speeds (it comes wired for 3rd
>gear).
>Has anyone rewired for lower speeds and used the amp for contesting?
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I can only offer some advice if you're planning on using the AL-1200
for RTTY. I had one several years ago and smoked the 80/160 tank coil
twice while RTTY contesting. IOW, the AL-1200 cooling is marginal for
full-power, full-carrier operation. I'd be careful about reducing the
fan speed. After replacing the tank coil, I held it to less than 1 kW
out and had no problems.
The problem is that the exhaust air from the tube is dumped into the
cabinet rather than being vented outside. I would strongly recommend
modifying it to vent air outside, although this would probably void
your warranty. The way Alpha does it with silicone rubber chimneys
would seem to be a good way. Please note I haven't actually tried
this, so I can't guarantee this is enough improvement. I sold the amp
to a fellow who works only SSB/CW and as far as I know, he's happy
with it.
Hope this helps.
73, Bill W7TI
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