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[Amps] MOSFET amp for 80 m

Subject: [Amps] MOSFET amp for 80 m
From: Angel Vilaseca <>
Date: Tue, 17 Jul 2018 16:29:56 +0200
List-post: <>
Hello everyone,

On this page,

I found a MOSFET amp description that does not need an output transformer. The author says that the output impedance of the transistors is 48 Ohms and that a balun is enough.
How can this amplifier have such a high output impedance?

And most importantly, if the output impedance is 48 Ohms and the supply voltage is 13.8V, then how can the output power be 5-6 W? If the formula V ** 2 / R is used, that is 13.8 * 13.8 / 48, the output power should be less than 4 W.

Best regards

Angel Vilaseca HB9SLV
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