At your risk.
1. A turntable such as Dual CS511 with its 12V DC popwered motor and only less than 1.5W power consumption.
2. A Pleiades 2 K117 JFET RIAA phono preamplifier. Typical idle current of the order of 50μA for the input stage, and 0.5A for the output stage. 12V or 24V battery powered.
3. The power amplifier (2 of them for stereo) in class A too is a Pleiades 2N3053 single transistor amplifier with airgaped output transformer, battery operated at 24V, 14mA. Driving Celestion Ditton 150 loudspeakers in a small room.
So it seems rotating the turntable platter consumes the most energy!
Please visit previous posts for more details of each amplifier. There should always be a suitble fuse in series with any battery for fire hazard protection.
D series electron tubes with battery filament cathode can also be used for such amplifiers (higher power consumption but much less than indirct heated 6.3 volt electron tubes). Caution of potentialy lethal voltage even if they may be operated at 48V plate potential. Please visit previous posts for more details on Pleiades DL93, (DL94), DC90 amplifiers.