90% of the pre late 80's game's were pure mono
no blance nessary,but to get the power u needed to bridge a dual channel
ic amp,u see at 1 time ic amps olny had xx thermal cap..ie will hit top temp when driven beyound xx wattage,they would go into what is called thermal runaway,
so game mfg's took a dual channel 5 watt amp bridged it and used the 10 watt
pot as the over all volume control by playing with the differnecial's
ie 1 side pushed + of the sine wave the other pulled the - side of the wave
thus doubling your power but keeping it thermal stable
ed