Vintage PAiA 4700 Series Modular Analog Synthesizer with Keyboard

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via this eBay listing

"Vintage PAiA 4700 Series Modular Analog Synthesizer with Keyboard – Needs Repair

Offered here is a PAiA 4700 Series Modular Synthesizer, produced between the early 1970s and early 1980s. This system is being sold as-is and will require service to be fully operational.

Functional Status

VCO 1: Powered and producing signal. Can be patched through the filter and mixer and triggered via the keyboard.

VCO 2 & VCO 3: Not producing output. Both modules are not connected to power or ground.

Sequencer (4780): Does not power on or respond. The power and ground wires are present on the bus but not connected to the sequencer module.

Filter (4730): Produces sound when triggered through the mixer.

Keyboard / Pitch Tracking: Synth triggers properly, but pitch does not track consistently across notes within the same octave and will require calibration or service.

Internal Condition

Power and ground wiring for the sequencer, VCO 2, and VCO 3 are disconnected internally.

Loose wire ends have been insulated.

Reason for the disconnections is unknown.

Included Modules

4720 VCO (x3 total)

4730 VCF

4740 Envelope Generator (x2)

4710 Balanced Modulator (x2)

4711 4/2 Mixer

4712 Reverb

4770 Watt Block (x3)

Control Oscillator

4761 Wing

4780 Sequencer

Notes

No patch cables included

Vintage condition with cosmetic wear consistent with age

Not fully functional and sold as-is for restoration, repair, or knowledgeable users

The PAiA 4700 is a historically interesting DIY-era modular synthesizer with a distinctive analog character. This example will appeal most to technicians, restorers, or modular enthusiasts comfortable with vintage electronics."