I can understand some buyers' reluctance to purchase Chinese made productsThis really goes for their output transformers very much so.
I posted up on page two a graph where the output transformer rings like a bell in the vhf this can sometimes be band-aid fixed (settled a little) by using a **** load of feedback, but doing that is not good.
Because global feedback is not a good thing and should only be used in small doses as a clean up tool, better off to use local feedback anyway, but that would not have an effect on curing this vhf output ringing.
Cheers George