Sony STR-GX90ES vs Sony STR-GX99ES

[dman777]

Is there a big difference in quality between the Sony STR-GX90ES vs Sony STR-GX99ES? I am finding the Sony STR-GX99ES, which was built in 1992, to be quite a bit cheaper on the forums.

 

[luxmaster]

Better quality but the 99es is a surround amp and the 90es is a 2 channel amp.

 

[dman777]

Thank you for the info.

Isn't it bad that the Sony STR-GX90ES does not have a optical input?

Also, how does Sony STR-GX90ES compare to the Sony STR-GX9ES? As far as build and sound quality