[Heathkit] CW filter in a SB-310

[Gerry Steffens]

Heath Wizards,

I recently picked up an SB-310 with an SB-600 speaker for a friend.  It came
with 2 filters installed and a CW filter in a package.

There is no manual and I am not familiar with this or the other SB
relatives.

Clearly, I see where to mount the filter but where do the connections go?  I
suspect they go to the same places as in the related SB radios.

Where are those places for the CW filter?

Thanks,

Gerry