I designed and built a rather
large HF amplifier for all bands from 160M to
10M. It was based on a YC156 (3CX5000) tube.
Below is a couple of pictures of the amplifier:
Pictures of the tube, one of the
two vacuum capacitors, choke and tank coil (all
Some construction pictures:
6 KV 3 amp 3 phase powersupply: