The inductor in this circuit must be an air-core inductor as magnetic cores wreak havoc with audio signals. It is typically in the 1-2 uH range.
1. Various PVC parts: a small section of 3/4" pipe; a T fitting; a fitting usually used to join/glue two pipes in a straight line, but cut into 2 pieces (I used a band saw) so they can slide onto the 3/4" pipe; and a large pipe fitting that I believe is a compression joint (not sure exactly what it is but they are easily found at Lowe's). I did not use PVC glue but you may want to on the T-handle.
2. 14 Gauge coated magnetic wire. I chose this gauge to minimize the resistance of the wire - the amplifier I am building is 200W per channel so I need a very heavy gauge.
3. Some 3/4" electrical tape
4. Tools: Not shown in picture but you will need wire cutters, box knife, and scissors. A drill and small drill bit. A band saw or hack saw to cut PVC pipes and fittings.
5. Optional - a meter for measuring inductance.