Been thinking of different options to change the character of my Germino Lead 55. I'm not looking for a specific tone, just some occasional versatility. I'm too poor right now to consider another amp. Been wondering what the change from EL-34's to KT-66's would get me in this amp soundwise? Has anybody out there tried it? I plan on e-mailing Greg, but I thought I would ask here also for some other possible viewpoints or experiences. Also, any other suggestions for some changes that I haven't considered or don't know about in this amp? Thanks, John.