Lee, the TR751A uses a Mitsubishi RF power module, part number M57727. RF
Parts website list a price of $64.55. The question may be if they have
stock. Not sure if this power module is still in production. Replacing
it is pretty easy - after removing the TR751A top and bottom cover you can
remove the entire rear housing that holds the heat sink and RF power module
with eight screws, two on the top, bottom, left, and right.
73, Jon
W0ZQ
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