I have three Lionmaster engines: T1-duplex, J3a Hudson and D+H Challenger. "chuff seems to work fir the T1, it worked for a while for the J3a and doesn't work for the challenger. It's my understanding that the chuff is synchronized to the wheel rotation, but what is the mechanism? With ERR soundboards, a reed switch and a magnet attached to the tender axle is the mechanism.
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If you provided actual product numbers, we could probably answer this more accurately. Depending on the vintage of the locomotives, it's probably a cherry switch on an axle cam for TMCC or early Legacy. On most newer Legacy, the chuff is generated from the flywheel tach internally on the logic board.
@gunrunnerjohn posted:If you provided actual product numbers, we could probably answer this more accurately. Depending on the vintage of the locomotives, it's probably a cherry switch on an axle cam for TMCC or early Legacy. On most newer Legacy, the chuff is generated from the flywheel tach internally on the logic board.
The "box" # is 6-38913
Well, 6-38913 is not a number that Lionel or the rest of the Internet recognizes as a Lionel locomotive, care to look again? 
Probably 6-38013
Yes, 6-38013. (Shakey old fingers)
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