The Eimac 4CX3500A Power Amplifier tube in the WQNR-FM Harris HT5FM transmitter was failing and had to be replaced. A recent lightning strike had also damaged a few devices including the panel-mount surge/transient protector.
![](http://www.albroadcastservices.com/wp-content/uploads/2021/10/20210913_100549-WQNR-Before-PA-Tube-Replacement-1024x532.jpg)
![](http://www.albroadcastservices.com/wp-content/uploads/2021/10/20210913_120811-Pulled-4CX3500A.jpg)
![](http://www.albroadcastservices.com/wp-content/uploads/2021/10/20210913_120833-Pulled-4CX3500A-view-2.jpg)
![](http://www.albroadcastservices.com/wp-content/uploads/2021/10/20210913_121026-Replacement-4CX3500A.jpg)
![](http://www.albroadcastservices.com/wp-content/uploads/2021/10/20210913_142250-TPO-After-Tube-Replacement-1024x587.jpg)
![](http://www.albroadcastservices.com/wp-content/uploads/2021/10/20210913_150643-Transtector-Installed-and-Operating.jpg)
Alabama Broadcast Services, LLC
Broadcast & Communications Engineering and Maintenance Services
The Eimac 4CX3500A Power Amplifier tube in the WQNR-FM Harris HT5FM transmitter was failing and had to be replaced. A recent lightning strike had also damaged a few devices including the panel-mount surge/transient protector.