Myles, A question about attenuators. I have a 1959SLP 100w Marshall. I bought it back in 1976 with a straight and a slant cab. I decided to have installed a master volume knob figuring this would save my hearing some. Since it was done way back when, i feel its not that great of a sound and now am considering buying a attenuator. A couple of recomendations have been the Power Soak and a Marshall Power Break. My question (finally) is could I use a atteunator on my amp even though there is a master volume on it? Also, I have heard from one person that the Power Break actually blew out the tubes in his amp,,now I'm wondering if these are safe units...and seeing that you crank your amp in order for the attenuator to work properly, will the be alot of hiss or noise? Thanks in advance for your input. John