Hi I am in the lucky position of having the chance to buy either an EC Vibro Champ or a 57 Custom Champ and need your help to decide. The EC Vibro Champ has the tube bias tremolo and a half power switch which I really like. The 57 Custom Champ has neither of those things and therefore may be a more "pure" circuit and a better tone? So probably my main question is if the features of the EC Vibro Champ compromise the purity of the circuit and therefore the tone or not. Any other opinions are highly appreciated. Thank you!