I recently bought a 74 Canadian Superlead, which promptly stopped working after 5 glorious minutes. Heres a link to the auction: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=38075&item=7321316050&rd=1 These Canadian Marshalls are a bit unusual due to more stringent electrical standards than US and UK and resulting modifications for the Canadian market. I received a repair bill as follows for this "nonmodded' amp: -replace wrong fuses -replace shorted tubes and rebuild bad bias supply -clean pots and jacks -Note: PC board has damaged traces from previous repairs and mods. many traces damaged & patched with wire. Parts included: 1-4A s/B fuse 1- 1A F/B fuse 4 EL34 Winged C's 2- 1 mega cts pot 1- .0047/600v sprague cap 2- 8wt/150v sprague cap 1- 47k 1/2w bias resistor 1- 25k bias pot I got the amp back from the tech and played it for 1/2 hour and the amp dies, no power no nothing. I turned it on after 5 minutes and it worked fine, then after a 1/2 hour same thing and it went on again after 5 minutes. This time I didn't play it again. I have a few questions: 1)Any idea what my problem could be? 2)In one of the photos there is an outline for two parts on the board in white that don't appear to be present, any idea what thats all about? 3) Any suggestions as to any additional work that should be done froma preventative maintenance or tone standpoint? 4) Any observations or comments on the amp from the pics would be appreciated. Thanks in advance for your help. Links to pics: http://tinypic.com/5n4sxh http://tinypic.com/5n4t2b http://tinypic.com/5n4suc http://tinypic.com/5n4t4h http://tinypic.com/5n4t8p http://tinypic.com/5n4tbm http://tinypic.com/5n4ti1 http://tinypic.com/5n4tjq http://tinypic.com/5n4uuq http://tinypic.com/5n4tg8 I have taken the amp back to the tech since as the power shuts itself off after 1/2 hour. I can turn it back on again after 5 minutes. The story I got from the tech is the power cord is too loose in the electrical jack. This is obviously incorrect as I have used different jacks since and have had the same problem. The only other thing it could be he said was a thermal breaker inside the power transformer. if that is the case i would think something is causing this to activate. Anyone ever hear of this or have any ideas? Thanks for the input.