Zapco SP7-SL Equalizer Old school for sure, rare here it seems

Description

Zapco SP7-SL Equalizer Old school for sure, rare here it seems. Condition is "Used". Spec's below and manual's are available for free online.
Last connected about 7 years ago. Worked fine HOWEVER when you turn a few of the knobs you can feel some are not as smooth as others. Kind of like there's grit in there or something. Once set I rarely turned them so it was never an issue with me and didn't seem to effect the sound at all. Might be able to be lubed with an electrical lubricant, then again maybe not so be aware of this. Overall I'd give this unit about a 5 but it did still work fine.
From what I can tell, MSRP was 9.99 and could be had for a bit under 0.00. Professor Google gave me this information therefore take it for what it is.
Note: I haveother Zapco products for sale here.
ALL ARECONNECTED VIA SymbiLINK and not RCA’s. NO MOUNTING TABS, BRACKETS OR ANYTHINGTHAT IS NOT PICTURED IS INCLUDED. BUYER ASSUMES ALL RESPONSIBILITY FOR CONNECTIONS,MOUNTING AND RELATED ISSUES.
Please – askany questions BEFORE bidding. All items are sold as is and are described as honestly as possible.
Max. Output Level / Balanced: 16 Volts
Input Impedance: 10K ohms
Output Impedance: 600 ohms
T.H.D. + Noise: <0.002%
S/N Ratio: 100dB
Frequency Response: 2Hz - 150KHz
Stereo Separation: >80dB
Dimensions: 3.25"L x 6.25"W x 0.95"H
SymbiLink™ Balanced Input
Can drive 600 ohm loads
Pro audio balanced differential Inputs
High quality PC board with ground plane
Very low noise & Distortion
Clipping LED’s monitor all 28 op-amps
1/2 DIN size
Surface mount technology
Separate gain switches for both input and output
Seven 1.25 octaves of Equalization
Can accommodate 8 volt (16 balanced) input / output signal levels
Very high quality, long life, low noise potentiometers
SP7SL - Zapco SP7 SL SymbiLink Seven Band EQ with Gain