Probably this one about 6 or 7 years... not sure which verison of electronics it has. It does have the knob on the top of the transmitter. For some reason I thought it was volume control. Somewhere there is the original manual but I haven't located it yet. This and the Sherman I have, have been basically sitting since we moved about 5 years ago. I'll try trimming it with the knob on top. Probably what the problem was from the beginning as I don't remember it pulling like this before. But at least it's been gone through and cleaned up.
