what does a Rectifier tube do?


I have an Air Tight Atm1 amp which uses 2 5ar4 Rectifier tubes. The manufacturer calls it Mullard Rectification. My question is what is Rectification? I ask becuase AirTight makes ATM3s which use the same tubes (EL34) but do not use 5ar4s for Rectification. Would that mean there is a different sound even though both amps use the same Output tube?
justlisten

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thanks for the input so far.....the AirTight 1 (which I really think is the best tube amp Ive heard) uses 2 5ar4 rectifiers.....the AirTight 3 which is an amp Ive have always lusted after uses the same output tubes (el34) and input tubes, but does not use 5ar4 rectifiers. Each amp uses same transformers, point to point wiring and exact parts, Would the amps sound the same or in what way would the Atm1 differ sonically vs the Atm3 because of the lack of the rectification?