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If you own the 100 watt model, it has been wisely recommended that you attach a cooling fan to help dispense with heat on the fins in the rear. The cooler you can keep the amplifier stage the longer your radio will operate. Furthermore, it is not necessary to run this radio at full power. If you step the power back about 120% you will gain four times that in operating life.If you own the 100 watt model, it has been wisely recommended that you attach a cooling fan to help dispense with heat on the fins in the rear. The cooler you can keep the amplifier stage the longer your radio will operate. Furthermore, it is not necessary to run this radio at full power. If you step the power back about 20% you will gain four times that in operating life.