The 12SQ7 (in metal) or the 12SQ7GT (in glass) is a dual diode (typically used for an AM detector and an AGC detector, and a high-gain audio triode. I would guess that the two "dials" (actually potentiometers) are probably volume and tone controls. The 50L6 is a beam power tube, an audio amplifier capable of about 4 Watts output. The 35Z5 is a half-wave rectifier tube, rated to 235 VDC and 100 mA. The transformer is probably an audio output device. The combination of the three filament voltages adding to nearly 115 Volts, and the fact that 35Z5's were often connected directly to the AC power line, makes me think there is no power transformer. (Be careful, depending how the wiring or plug is connected, you might have a hot chassis.) The whole gadget thus is probably an AM detector and low power audio amplifier.