Quote Originally Posted by mw0uzo View Post
Just make sure they're all from the same batch. I have not seen any signs of one device conducting harder than the rest.

For reliable operation up to 30V, use an output transformer secondary of 3 turns. For low voltage e.g. 14v, high power operation use 4 turns then you can get 200w+ out at 13.8V.

The voltage limit is 30V due to use of a 5V regulator (35V max) in the bias circuit.
Beyond matching the transistors from the same batch, I was concerned about matching the phase inputs to the transistors as well. I am not sure what the schematic looks like on this thing, but the phase delays that occur will naturally be more obvious at the higher frequencies.