My miniloop receiver, patterned after the Silver_Marshall Round the World Four, with some deviations to fit my available parts.
Too many picture links to spend time pasting them individually, just look on my server (home computer, on during the day and off at night).
http://99.239.146.96/Projects/Miniloop_radio/Tube lineup is as follows:
RF preamp tetrode=Cossor 215SG
Regen detector=Cossor 210HL
AF amp=Cossor 210HF
It all runs from a single 90 volt supply, though it can run on a bit less. Regen and screen voltage are derived from the 90 volt input.
Filament supply has been designed to run the 2 volt tubes from as much as 5 volts (commonly available from computer supplies, 7805 voltage regs).
Shielding was found in the prototype to be entirely necessary since the circuitry is extremely sensitive and will feedback onto itself without it.
The shielding copper and copper base is just some double-sided unetched PC boards I had. The copper base is glued to the wood to avoid the ugly screws.
The variocoupler was made from a couple of different diameter cardboard tubes (garbage). The windings are #26 wire, 7uH each, and then gently rolled in hot wax from unscented Ikea white candles I melted down.