T1 = T2 = T3 = BF199
T4 = 2N4427, BLX65, 2N3866, 2N3553 L1 = rf choke (20 turns, 0.2mm on ferrite core, 0.3mm)
L2 = 4 t, 0.7mm, 4mm
L3 = 6 t, 0.8mm, 6mm, at first turn from T3
L4 = 10 t, 0.2mm over ferrite core
L5 = 7 t, 0.8mm, 6mm
L6 = 4 t, 1mm, 8mm, 10mm long
This 1 watt fm transmitter has been tested and is working as mentioned in this article. If you use replacement components the performances can vary a lot.