You'll need to do some math to get the bias current right. If bias is 1 mv for 0.05 ohm resistors, you need to set 6.6mv for .33 ohm. larger value emitter resistors add quite a bit of thermal stability by producing local feedback. other consequences are a tiny drop in output power, and a lessening of damping factor (feedback ratios interact with emitter resistors) You see modern amps, mostly MOSFET, with 0.1 or less because they really aren't needed at all except for safety. Since you are building large analog anps, I see no reason for 0.05 ohm. If you want to test something, try comparing distortion at 100 watts between 0.1 ohm and .47 ohm emitter resistors. I doubt you'll measure a difference. My advice is use the .33 ohm.