> The two parts look nearly identical from the datasheets.  Since it was common 
> to simply add an application diagram to an existing datasheet instead of 
> creating a new part number, the LM9022 was probably a way to use LM4871s that 
> failed some of the audio amplifier specs that would be critical to an audio 
> aplication but would be of no concern for driving a VFD.
> 
> I have 200 of the LM9022s, I'll get some of the LM4871s and compare them.

I'm tempted to get one of each and have a friend decap and examine them.

- John

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