Thanks Jim, will pull the tubes, have a look and report back. I haven’t had
them out in about a year so ---
Regards,
Larry
-----Original Message-----
From: MU 4CX250B [mailto:4cx250b@miamioh.edu]
Sent: Monday, October 17, 2016 10:45 AM
To: Larry Williamson <larry@mygbi.com>
Cc: amps@contesting.com
Subject: Re: [Amps] QRO 2500dx-- heating up
Larry, have you cleaned the tubes recently? Dust and grime could be blocking
the airflow. I clean the 8877s and 3cx800a7s in my station by running them
through the dishwasher.
73,
Jim w8zr
Sent from my iPhone
> On Oct 17, 2016, at 9:46 AM, Larry Williamson <larry@mygbi.com> wrote:
>
> I have a 2500dx that has ran great over the years. Here is the issue now----I
> was running about 800 watts rtty and all of a sudden the amp shut off, just
> like you turned the switch off. Wondering what the heck happened and
> completely stunned, after about 2 minutes it turned back on.
> Switching over to the dummy load it did the same thing? Different bands do
> the same thing. So I set an external fan on top of the amp to help remove
> some of the heat from the interior.
> Typically the temperature at the tubes run about 140- 155 degrees Fahrenheit
> @ 800 out rtty. So again, same setup with the external fan helping to remove
> some heat-The amp runs great.
>
> It appears that something is heating up from excessive heat and shutting off
> the amp. The internal fan appears to be working normally.
>
> Any input from others is appreciated!
>
> Regards,
> Larry
>
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