Hey all. I have an 800 that I really like a lot. I have had several over the years that have had more gain (unboosted). I have known good preamp tubes and have tried several of the known 'good ones" since owning this amp. I feel like this one has nowhere near as much stock gain as the others I have had. I want to test the components that effect the gain of the amp and I need help pointing out where I should start. I have safely discharged the caps and have done a full cap job. I just am not 100% familiar with what I should be checking. Hoping you fine folks could help me out!