Restoring the Vintage QUAD 303 - January 2024 - Silicon Chip Online
The QUAD 303 amplifier and associated QUAD 33 preamplifier (that they call a “control unit”) were introduced in 1967 and sold until 1985. These units belong to fellow HRSA member Ray Thomas. I was very happy to exchange some time refurbishing for a chance to listen to a classic QUAD amplifier. by Jim Greig
Source: siliconchip.com.au