The Lisson Grove AR-1 is a vintage style tube compressor based on the classic Altec compressor that was used intensively in the ’60’s. However, the AR-1 has some modifications. Some of which are in the circuit and some functional. The quality of each component in the units is of the highest possible standard, and the unit is hand built from top to bottom. The Lisson Grove AR-1 has been built from a love of the sound of a bygone era.