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The Trainsounds tender I picked up last weekend decided to go silent on me.  Could being operated by a postwar RW transformer using a zener diode for the whistle circuit have cooked something?  When run on a modern Atlas transformer, one can hear faint whistle and bell noises, regardless of volume control or on/off settings.  

Any suggestions?  I've already reseated the plugs and the sound chip... 

Thanks!

Mitch

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