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Ashly PQ66 Parametric EQ

Anyone familiar w/ this goliath? Made in late-80s/early-90s. It's a 3U space 4-band stereo (dual mono or link-able stereo) parametric, but I can't find any specs about it on the web. I know Ashly was an early pioneer of parametric EQ. Is this sucker tube? Transformer? Gerbil on a wheel (it's big enough to house a whole family of wheel-running rodents)?

what is this "speed" knob on my ashly sc-68?

ok, i purchaced a couple of eq's on ebay. one was an ashly sc-66a, which i like. ( if anyone knows anything about the balanced XLR mods to this unit please drop me a line). the other, getting to the point, was a 7 band notch filter ( model sc-68). it seems like a straight forward cut-only eq, except one knob that is labled "speed" (slow to fast of course).