Kevan, I was just thinking about your humming Piranha - no kidding! Have you (Kevan) tried changing the pressures to see if the pitch of the hum changes?
It is possible that there is a burr (from machining) somewhere in the torch that is creating that hum. It could also be in a valve.
I don't think that it presents any danger.
So, when you say all the torches at Frantz, which ones did you see/hear? Because, that is odd.
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