Inductors of the receiver are wound on the tube base
of old tube UO- 186 or V0- 188.
Note of va3znw:
At the time (70s) my friend
gave me some old defective tubes UO- 186. I used the tube base
for inductors for my receiver. Today, in Russia,
good UO- 186 tube made in 40- 50s may cost (for audio- fans) almost
Inductor for the 40- meter has 19 coils. It is wound
“turn to turn” by wire in diameter of 0.8- mm (20- AWG), tap made
from 7s coil from the cold end. Ends and tap of the inductor are
soldered to the pins in the tube base. .
Inductor for the 20- meter has 9 coils. It is wound
by wire in diameter of 1.0- mm (18- AWG), tap made from 3d coil
from the cold end. Between wires is wound a thick tread to provide
gap in 0.3- 0.4- mm. Ends and tap of the inductor are soldered
to the pins in the tube base.
The Plug- In inductor for needed band is plugged to
socket installed on the receiver chassis.
2 shows the regenerative receiver and plug- in inductor.
3 shows the plug- in inductor at the receiver chassis.