[Amps] QRO 2500dx-- heating up

[Larry Williamson]

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 at miamioh.edu] 
Sent: Monday, October 17, 2016 10:45 AM
To: Larry Williamson <larry at mygbi.com>
Cc: amps at 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 at 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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