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Re: [Amps] QRO 2500dx-- heating up

To: Larry Williamson <>
Subject: Re: [Amps] QRO 2500dx-- heating up
From: MU 4CX250B <>
Date: Mon, 17 Oct 2016 10:44:37 -0600
List-post: <">>
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.
Jim w8zr

Sent from my iPhone

> On Oct 17, 2016, at 9:46 AM, Larry Williamson <> 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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