Rich330P4
A note on the MPC era whisteling tenders.
It is wise to replace the insulating foam underneath the sound board in the tender.
Because of aging the foam will deteriorate and allow the board to short out on the frame.
This can be the cause of non working whisteling tenders.
I cut a piece from an egg carton top to replace the worn out foam in the one l had, it worked perfectly.
Happy Rails!
dave