Agilent 1NB7-8477 RF Transistor Amplifier Replacment

[bostonman]

I'm uncertain whether to ask this question here or in the Manufacturing & Assembly area.

Maybe some of my posts regarding repairing an Agilent scope have been read already, however, I've come to the end of the road troubleshooting this and believe the hybrid is the culprit.

I've search and the only place I can find these hybrids is through Ebay (see link below) - buying these is a big gamble. My questions: does anyone know whether these are counterfeit? The main question is replacement and whether anyone knows a procedure for replacing these type chips?

My understanding is a ground pad exists underneath making this more challenging. I have a hot air pencil, however, I don't have much experience with replacing these type chips (i.e. how much heat to apply, head shape to use, etc..). Not that discoloring it is a big deal, but it's obvious a safe way exists to replace them that doesn't involve enough heat to show burn marks.

Just for reference, the hot air pencil I have is: 852D+


https://www.ebay.com/itm/323642939494?hash=item4b5a9f5866:g:swsAAOSwv~lavdgE

[bostonman]

Should I remove this post and move it into manufacturing instead?

I wasn't sure which place to post it.