doug coil ampl knob ..set at the max 13 .. over heating .. JIM?

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Hi All Im trying to word this properly .. ack!yesterday when I was coiling I had the AMPL knob set to 13 on the meter .. S had told me to make sure it NEVER goes over 13 .. after a few min it was sooo HOT .. then after 5min it kept shutting off , dropping to zero on the meter and then after a few seconds it would turn back on and would jump back to where it was after a few min of this I turned the AMPL knob down to 12 and then it was fine for the rest of the session and tonight I kept it at 12.5 and it was fine during a 20min session I just want to make sure that I am not losing any killing strength by having the AMPL knob to 12.5 instead of 13 I hope this makes sense .. "Until one has loved an animal, part of their soul remains unawakened."