I am still developing my abilities and find myself all too often
struggling with op amp design.

Can anyone here suggest an "all purpose" amplifier built around a
readily available op amp and transistor follower that will operate
within the specifications below? Preferably without changes in
componentry except to upgrade the power transistor depending upon load
requirements.

DC coupled with frequency response DC to 20KHz
Input signal level 1-2V
4 to 12 volts single supply
Low power DIP op amp, suited to battery operation if required
Variable gain, unity to 10 via trimpot (dependent on rail V)
Swing as close to rail as practical without using a rail-to-rail amp
Drive resistive load 20 to 200 ohms (dependent on power transistor
used.)

Other specs are non-critical.

Are any of these, such as the wide supply range, inherently
contradictory to a predominantly fixed value circuit?

Any help would be very much appreciated.

Trev Morton