equalizer?

[Rob 515]

The 1653A is a professional 1/3rd octave equalizer and a pair of them would do a remarkable job on a home stereo. The 1653A has unbalanced in/out unless the following transformers are installed; 15335A input / 15356A output. Jumpers must be installed in the transformer octal sockets when they are not installed.

Hi, I can't find any manuals or anything anywhere on the net for the altec 1653A only for 1753a. Would you happen to know of anyplace where I could download or view that online. Trying to figure out how I should set the high pass and low pass filters using 299-8a and 515-8GHP, but would be nice to have schematics, specs and all.
thanks
rob