All tested using an Amplitrex AT1000 with the following results (40 is minimum):

Tube 1- 92/92% ip 91/91% gm

Tube 2- 98/99% ip 103/102% gm

Tube 3- 102/101% ip 91/90% gm

Tube 4- 100/79% ip 94/86% gm