This is my homebrew 3 tube
regenerative receiver for 80 meters. I had bought a 1920's
homemade AM broadcast receiver at a swap meet and used it to build
this one. I disassembled it, cut the varnished chassis board
down to size, cut the original bakelite front panel down, and used
the original copper foil shielding behind the front panel to reduce
hand capacitance. The knobs are original also. The
receiver uses three type 30 tubes running off of batteries. It
is surprisingly sensitive. I would like to slip a 4th tube in
there for an RF front end. I will likely use a 24A to stay
with the battery these. I used a pair of D cells for filaments
and a stack of transistor radio batteries for a 36 volt
supply. I think it would run nearly forever off those
batteries.