We are heading over to Snake Radio Customs in the USA for a short video and look at a KL-703 being tested to see what power it’s packing! The amplifier is an absolute beast and it killed one of my 50 amp power supplies absolutely stone cold. Better is to run a 60-80 amp power supply as it really likes amperage this very well working amplifier.
Link to the video: https://youtu.be/azx_LgRUK40
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Seems like a huge amp just to get to 350 watts. Probably better off with a 4 x 2879. Heck, a little KL203 will get you 100 watts and it’s 1/6 the size.
Amp will make 500 watts AM FM SSB but needs minimum 60 amp PSU. On video it’s I think a 30-35 amp PSU.