This paper considers combinations of frictionless mechanical amplifiers arranged in a cycle so that the amplified signal passes around through an endless chain of such systems the output of the last system being fed into the first. It appears that while each amplifier may be reversible in the absence of friction, the effect of the combination is such that the signal would be unable to pass around the cycle indefinitely, using the same energy over and over again. It is felt that the assumptions upon which this cycle is based are related to some of the conditions met with in consideration of open thermodynamic systems such as heat engines and living organisms when in finite environments.