ARP purchased rights to the Siel Orchestra sometime in or after 1982 and rebranded it as the ARP Quartet.

This one was purchased through the internet as a repair project. As such, number of repairs and services were undertaken on this particular Quartet, including but not limited to:

• Thorough cleaning inside and out

• Complete recapping of all electrolytic capacitors

• Replacement of nearly all logic ICs

• Cleaning, disassembly and repair of multiple slider potentiometers

• Rebuilding of one paddle switch arm, with epoxy

• Deep cleaning of all key bed components

• Cleaning of keyboard bus rail

• Removing cheeks and stripping and sealing