The VK4YE 1 Kilowatt Linear Amplifier.
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Plate Tank Circuit.

The plate tank circuit is a modified pi-network. The plate tuning capacitor is tapped to the centre of the 10m coil to allow a more optimum value of Q to be obtained from 20m through to 10m. The 10/15/20m coils should be wound with 3.6mm copper capillary tubing that is used in pressure gauges, but 1.5mm wire can be safely used below 20m. Hobby shops often stock suitable capillary tubing. Try to orientate the 10m coil at right angles to the 15/20m coil to minimise coupling and losses.

Band
Turns
Diameter (mm)
Length (mm)
Wire Gauge
160m
80m
40m
30m
25turns
tap at 13 turns
tap at 7 turns
tap at 4 turns
40
60
1.6mm
20m
17m
15m
12m
8.5turns
tap at 7 turns
tap at 3 turns
tap at 2 turns
40
55
3.6mm capilary tubing
10m
5 turns plate tuning capacitor tapped at 2.5 turns

30
45
3.6mm capillary tubing

For the 160m to 40m coil, which is wound in one continuous winding, the turns should fit tightly against each other. A tapping point can be made by twisting a small loop in the wire, then continue with the winding to the next tapping point. I used 60mm PVC pipe for the coil former.

Filament transformer. | Split stator plate tuning capacitor.
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