The quick connects can make a torch humm like that. What pressures do you have your oxy and propane set at? If the pressures are set fairly low, it will make the check valves in the connects vibrate and it makes the torch humm. I had that problem with a torch a while back and when I took the connects off it stopped again. After that I called the manufacturer of the connects and they explained to me about the check valves.
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Kristian Turley
Old School Glass
(Generations Glass has closed it's doors and is out of business)
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