This is Helmuth's shack with the nicely-made loading coil in all its' splendour.

Here is Helmuth's transmitter on a monster heatsink! The RX filter using pot-cores is bottom left.

Here's a big closeup of the transmitter. I don't know what the circuit is but you can almost trace it from this picture. Looks like four mosfets in parallel with a pi network output circuit?