I have a JCM 25/50 Model 2555 Silver Jubilee amp. I bought a used Marshall Power Brake a few months back. I'm absolutely thrilled with being able to  use my amp full blast at home in my downstairs studio. But I've tried to find out some information and background on the Power Brake, and there just doesn't seem to be any infor to be found anywhere. Since Marshall does not seem to have a US contact number anymore, I tried to email the question to the suggested contactus@marshall.com email address. It's been more than two months, and no response. Has anyone out there used one of these? I'd like to get your thoughts and what you experienced. And why did Marshall stop making them?