Impedance Matching 50 Ohm RF Amplifier to 12 Ohm Load at 500kHz, 400W Output

Hi All. I hope this is the appropriate forum to ask this. I needed some basic advice about impedance matching. I have an RF amplifier with 50 ohm output impedance, capable of generating 400W output power at 500kHz. I am trying to deliver this to a 12 ohm load.

I looked online and figured out that I need to match the impedance of the amplifier to the load. My question is what is the best way to achieve this? Would it be possible to simply use a capacitor and inductor and put an L section to the output of the amplifier? I saw that online stores have very cheap capacitor and inductors that is rated for very high voltages.

If that is not going to work is it possible to buy any transformers that would do that? For instance I saw that there are many cheap 220v-110v voltage converters, which should have 2:1 coil ratio. So in theory that should convert 50 ohm to 12.5 ohm and matches to my load. Will these work at 500 kHz as required for my application? Or are there other type of transformers that I can use for this purpose (there are many many types of transformers and I got confused which ones are suitable for impedance matching)?

Thanks a lot for the help.

A AC Power transform is likely not able to provide you with the impedance transformation as it is made to run at 60Hz, not 500KHz. The core looses might be very high and therefor you would have a lot of heating.

There are other methods, but you may need to find or make an RF power transformer.

How far away is the load from the amplifier?
How wide a bandwidth is the signal?

Thanks a lot for the reply. The load will be about 1 meter away from the amplifier. The signal doesn't have any bandwidth, it is a single 500 kHz frequency, no modulation etc. Another thing is that the signal will not be continuous, we will use it only for 1-2 seconds then turn it off.

RF power transformer seems to be a great idea. Do you know any supplier that can do this kind of device by any chance? I looked around a little but couldn't find anything that fits.

Finding a transformer for that much power will be difficult.
An alternative, take 3 100v 33nF caps in series at the output of the coax feeding the load and a 7uH 10A inductor like a coil craft MA5173 in series with the load and that should match it and handle 400W.

Basically the matching network is 11nF (33/3) to ground and 7uH in series to the load.
The capacitor will see 200V so using 3 100V in series will give you margin and the inductor will carry 8A. The inductor suggested is a toroid so it won't radiate.