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Vintage GRASS 7D Polygraph Tower – Massive DIY Synth/Parts Goldmine! - $350 (Madison Central East)
condition:
fair
make / manufacturer:
Grass Instrument Co
model name / number:
Model 7D Analog Polygraph
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This is an authentic Grass Instrument Co. Model 7D Analog Polygraph Tower straight from a laboratory. If you know vintage analog gear, you know these individual slot-in pre-amplifier modules (like the Grass 7P series) consistently sell on eBay for $120 to $160+ EACH to builders who harvest them for their high-quality vintage transformers, pots, and modular chassis. This tower is fully loaded with a massive stack of modules, offering well over $1,000 in raw part-out value if you have the time to list them individually. I don't have the time to part it out, so I am passing the massive profit margin on to a local buyer who wants the whole unit.
What You Are Getting (The Part-Out Breakdown):
A Full Stack of Modular Amps: Multiple individual Grass analog pre-amps and DC driver modules.
Side-Mounted Electrode Selector Panel: Features an incredible mechanical matrix switch deck with unique vintage multi-position dials.Knob-Collector’s Dream:
Dozens of matching vintage solid metal knobs, classic toggle switches, and modular bay faceplates perfect for Eurorack or guitar pedal builds.
Heavy Duty Stainless Steel Cart: Rugged industrial rolling frame with built-in chart recorder bed and storage shelves. Perfect to upcycle into a killer studio rolling bar cart.
Condition:Untested. Sold strictly AS-IS for parts, harvesting, or retro industrial display.The open back panel provides instant, easy access to all internal analog wiring harnesses and modular backplanes.
Priced to move quickly. Bring a truck, a ramp, and a friend—it is solid steel and heavy, but it rolls easily on its wheels!