SOIC is quieter?

[moeburn]

I just got some proper SOIC adapters, and i soldered an OPA2227U onto it. I plugged it into my amp, and i thought it didnt work. Then i turned the volume up all the way, and it was playing moderately quietly, while the other side was blasting away. This is the fourth one I've soldered, the other ones all had the same problem, but they werent on proper adapters. Is this supposed to happen?

 

[guzzler]

Does it work okay with DIP packages? I would only suggest you're soldering them for too long, but it's very unlikely you could burn out 4 opamps in the same way...

 

[moeburn]

Sorry, forgot to mention I was comparing them to an OPA2227P in the other channel (a47 four opamps). The SOIC version is simply quieter. I soldered a 2228UA on the adapter, and it worked just fine.

Can anyone conform my theory by testing these two side by side?

 

[tangent]

A working op-amp's voltage output (i.e. volume, in the case of headphone amps) is governed by the ratio of the gain resistors, not by the package style. There is solid mathematics behind this...you can't cheat it just by switching packages. Ergo, something is wrong with those SOIC chips.