DuMont Inductuners

[bigaudioal]

Anyone know anything about the DuMont Inductuners? I recapped my RA-108 Mansfield a while back. Got a raster and it is very stable, but was not getting any signal. Set has a round dial inductuner, which I know was used in the 108 obviously and possible the RA-105 as well. It is a different tuner than the one used in the RA-103 (Doghouse) model. When the mode knob is in TV mode, I was getting no TV signal, and was getting one FM radio station over 60% of the dial.

I then decided to try inserting a signal into the grid of the first IF tube. When I did that using a VCR I got a good video signal on the raster. So figuring my issue must be with the tuner. Tubes in the tuner have been swapped with no change. Anyone know anything about these tuners or have any ideas how to troubleshoot further?

Thanks.
-Al