[Elecraft] Hum on KPA1500

[Carl Yaffey]

Just tried a dummy load. No hum. So must be RF. On to the hunt!
Thanks, folks.
Carl K8NU


> On Apr 5, 2020, at 4:59 PM, Ken Winterling <wa2lbi at gmail.com> wrote:
> 
> Carl,
> 
> Does this also happen when directly connected to a dummy load?  If not then maybe you have an RFI problem.  Check all antenna connections and jumpers.
> 
> GL!
> 
> Ken
> WA2LBI
>  
> 
> 
> On Sun, Apr 5, 2020 at 4:51 PM Carl Yaffey <cyaffey at columbus.rr.com <mailto:cyaffey at columbus.rr.com>> wrote:
> I have developed a loud hum with the KPA1500 on 17m and 15m. A slight hum on 20m. All other bands, no hum.
> It’s power dependent. Loud at full power, hum reduces as power is lowered. Not too bad at 500w.
> Suggestions?
> 73.
> 
> Carl, K8NU.
>