I still use older 72MHz FM/PCM Airtronics equipment... and I'd like to buy up additional receivers for my transmitters...

I have a question about Airtronics receiver numbers... can someone explain how the numbering de-codes on 72MHz FM receivers. For example: on a 92765 receiver I know that the "6" is the number of channels... but, I'd like to know what the other numbers mean.

Thanks, Tom