I am thinking about this and tossing up whether to use plain 5 watt ceramic wire wound or go for 2 watt power film resistors.

My sums suggest the power disipation will be 0.50 watts per resistor where V 2sq / R where V=voltage = 0.50 volts R = 1.00 ohm (A=0.50 amps) ie 6 x 0.50 amps = 3 amps bias current.

Alternatively if more power is needed 2.2 ohm and 1.8 ohm (0.99 ohms) could be placed in parrellel for 4 watts due to temperature drift.

Please forgive me if my sums are wrong.

If this correct then I could use obtainable Philips metal film resistors in 2 watt ratings from Farnel!

This assumes of course metal film resistors be preferable over standard ceramic cased wire wound versions?

All comments and opinions are most welcome.

regards

macka