[Test-Equipment] Looking for help, please!

[Receiver]

Hi list,

Some years ago an old friend, now SK, cannibalized a Systron-Donner 
frequency counter, Model 1037-B.  He brought me a Gray rectangular box from 
it made by Motorola.  It is approximately 1.5" X 5.0" X 2.0" high.  It has 
the following stenciled on it:

MOTOROLA
K1001A  ASP02
Ser. No. 011054

On the top it has three small feed-thrus.  Each has a small solder lug under 
the lock nut.  The three terminals are labeled, E1, E2, & E3.  All three 
solder lugs are tied together and had a black wire attached.  E2 & E3 feed 
thrus are connected together and have a red-white attached.  There is no 
wire attached to the E1 feed thru.  I can't tell if my friend removed a wire 
here or if there was ever a wire there.

On my right when looking at it, the end has the following stenciled on it 
"FREQ.  ADJ."  Below that  there are two adjustment screws and below that it 
is stenciled "FINE"    "Coarse".  Below that there is one PAN head screw. 
There is also a label with 6 Motorola Patent Numbers and "Other Patents 
Pending"

My questions are:

1.   What frequency?
2.   What voltage does it require?
3.   I'm guessing that the Black wire (E1, E2 & E3 lugs) is negative and 
that E2 & E3 Feed thrus are positive and that the output is probably on the 
E1 feed through.

Can any one please shed any light on this?

TIA & 73, John, W4NET