Hi guys. I am thinking of ordering a 5751 in an attempt to improve the useable headroom of the Ultra Gain channels of my DSL40CR. At the moment with the stock tubes it is pointless turning the gain above 6 on the dial. After that the sound just gets mushier and the volume seems to dip out when palm muting. So would a new JJ tube like the 5751 or an ECC83MG shift the maxing out of useable headroom to somewhere like 8 or 9 on the gain dial? Also I am not sure which position to try one of these tube in. Anyone tried this? P.S. I cannot roll any of the tubes yet as my collection so far is only 1 ECC83 from 1997 that I removed from a Valvestate VS65R! Cheers.