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LM386 won't drive headphones

Other Parts Discussed in Thread: LM386

LM386 will not drive (no sound at all) 12ohm headphones.  Input is output of a guitar preamp and coupled with .22uF.  Power is 9V battery.  I tried all circuit gains per datasheet and varied the 10k input pot.  Included 10ohm and .05uF from pin 5 to ground and 250uF at output.  Circuit will drive a guitar amp just fine.   My goal is to use LM386 as headphone amp. Why can't it drive the headphones??  HELP!!