whistle controller

So here is at least one problem, that uses the copper oxide disk style rectifier. That type of diode is not very efficient and so with no load- nothing more than a meter- likely may not show much of a DC offset  and just using a meter set to DC really- let's be honest, is not exactly the best test rig either.

You need a proper test rig like a known working postwar whistle tender.

See this topic too https://ogrforum.com/...6-whistle-controller

Last reply seems important and relevant and why using a DC meter with no real load, you might not get a reading.

Thanks for the info and link. I tried it with a ten der that the whistle works and got nothing. Didn't pull the relay in so I guess I'll just get another. Is there anyone that works better?

Yes, either the DIY diode box version https://ogrforum.com/...5#74073050672023515, or IMO, some of the K-line versions were well built and heavy duty with modern diodes.

K-952B or C

Thanks I see one on the auction site a K line going to get it.

Jim