I sent two amps to a guy for a repair as he said he was an expert on these types of valve amps debrie .he emailed me saying they were done after 9 months , but a few days later I was going on my hols I emailed him several times when I got back but never replied kept emailing him over 10 emails no reply then tom said there firm has drivers in that area and after 2 attempts managed to pick them up for me guy was very surprised by this .tom sent them on to me and they are worse then when I sent them .the grey amp had low sound and the black amp was a little better but not as good as it used to be these was my late fathers who bought them new over 50 years and are in mint condition all I get out of the amps is a motor boat sound totally pissed off it looks to me that most of the valves have been changed and replaced by others has I made a note of the valves and they have different numbers I hate people when they say the can repair things and they cant some of the valves look like the ones that are in the 601 622 model bell and howells these valves sell for good money on ebay some over £100 each I also sent him spare new ones as well totally ripped off but that's life .thanks tom p for all your help regards david