The Circuit, a discussion.

Yes, this radio did work before I took it apart and yes, this is how the radio was wired. I checked it several times because I didn't believe it. The use of the 01A tube is only a guess. The tube socket is one of those bayonet types. The tube has a small little pin sticking out the side. There was a socket adaptor insert for tubes with smaller pins and there were a couple of tubes in the cabinet. But the tubes didn't fit the socket. So I decided to make my guess. A type 30 tube would also work in this circuit. I did make one circuit change. In my homemade radios I discovered that the grid leak resistor should go to the A+ terminal rather than the A-. So I am making that change.

First thing I notice is the parts count. There ain't much to this puppy! If compared with one of my homebrew radios, it is missing the bypass capacitor and rf choke.

Perhaps the oddest part about this radio is now the plate of the tube is grounded! I guess there is nothing wrong with that as long as the voltages between each tube element is what it should be. It is just odd. Looking further, the plate voltage appears between the antenna and ground. Again, kind of odd. The wire between the antenna and the tube filament looks like it serves no use. Again, perhaps a wiring error. I will test this radio with and without that connection.