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Message: <blockquote data-quote="Carolina Photo Guy" data-source="post: 41115" data-attributes="member: 1556">First, a comment. Canon is spelled with only one "n".Second, a question. Is this pre-amp sub-assembly for a microwave based communications transmitter?I can only extrapolate the size of the components from the relative perceived size of the connectors, so that heat sink is freakin' huge!With THAT amount of heat being pulled off, that makes me think microwave coupled with optical output.Of course, I could be wrong.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>