What do fellow VE-ers think of the above EQ unit? I bought it new some years ago, used it once very briefly and then promptly left home and worked o/seas for many years. The EQ was repacked into its original box, put into storage and has never seen the light of day since. Basically, it is still in new condition....
A few things:
a) At a guess, that unit is at/around/more than 30 years old. By your own description it has been sitting idle most of that time. At the very least it will need _all_ its controls checked and cleaned/lubricated if necessary. NOTE: Many slide-controls of that period used a proprietary silicon-based lubricant. If yours is such a unit, unless you go to heroic measures *and* find that same lubricant to replace what you remove, you will be better served simply to exercise the controls until they operate correctly than to clean with improper materials.
b) Writing for myself, I would suspect the viablity of any and all electrolytic capacitors in the unit, from the power-supply to any in/around the signal path. To the point where I would advise you to shotgun replace them. It won't cost you more than a few bucks to do so and it won't take much time. Those units are quite easy to service at that level. At the same time, other than the potential for a loud HUMMMM... it is unlikely that you will cause damage by trying it without replacing the caps first.
Cutting to the chase - equalizers can be useful. I keep one - I rarely use it - and two of my pre-amps have a large-than-typical group of tone-controls. A well designed unit will have an in/out switch, and with the better units when the slide is at 0, it will be entirely out-of-circuit. And the better pre-amps have a switched "EPL" connection - same idea.
Use it. Can't hurt, might help.
Melrose Park, PA