Hickok 615 Sweep Generator

[Chris P.]

I have a thread started here: http://antiqueradios.com/forums/view...p?f=8&t=194028 about this thing, but I'm not having much luck finding out what is contained in the "mod unit". Maybe someone here knows what it is?

Thanks

[bob91343]

Sweep generators, especially the lower cost versions foisted on the television repair people, are peculiar items. In order to sweep the frequency over a wide range, purely electronic methods fall short. So what they use is some electromechanical device to vary inductance or capacitance. I have seen loudspeakers used, for instance, in these sweeper units.

I'm sure that's what is in that 'mod' unit.

[bandersen]

The 615 is actually all electronic - or so the manual clams. I restored a 615 not too long ago, but I didn't dig into the sweep circuit deep enough to uncover that little mod unit thingy.

[Chris P.]

Thanks guys. Yes, it is electronic sweep. After studying this thing some more, I still cannot find the stub of a broken lead on that mod unit. It only has 2 wires coming out of it. If someone with 615 could take a look and see what R109 is actually hooked to it would be much appreciated.

Thanks

[bob91343]

I suspect that the MOD unit is not all electronic.