[Amps] 300Hz sidebands

[Geert Jan de Groot]

On 23/05/2021 20:52, amps-request at contesting.com wrote:
> I have several tetrode amplifiers that run from a 3PH 50Hz supply. With the advent of the FT8 I have become aware that I have 300Hz sidebands at only -50dBc, this is obviously unacceptable.

Apologies for asking, but have you tried a different driver transceiver 
to see if the signal (level and/or frequency) changes?

Geert Jan