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Hi bill, Maybe your pop is coming from shutting off the acetylene first with a combination of leaking mixing chamber O rings. That can make a very loud pop. The mixing valves could also need cleaned. A little cleaning will go along way to solve your problems. To check to see if the regulators are working correct, turn the mixing valves off, back out the secondary reguluator pressure valve, turn high pressure valve on then turn on low pressure valve to about 10psi acetylene. Let sit for a minute or two too stablize pressure watching to see if the low pressure gauge climbs any more than 10psi. If it climbs to 15psi then your regulator is bad. They same test for the oxygen gauge but set to read 40psi and if it raises too 60psi then the gauge is bad. Be sure and check to see if gas is leaking past the mixing chamber valves while checking these pressures. I do use a small Prest-o-Lite auto start LP/air hand tank for soldering a joint or two but for a larger number I drag out the small act/oxy cylinders. T_Bone
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