JBL S650 Synthesis THX Amplifier (Marantz MA500 module)
I have just acquired a massive (75lb) JBL S650 Synthesis 5 channel power amp. Made in the USA, circa 1997, it's a 5 x 125 wpc with full monoblock design. I have since discovered that it's actually based on the Marantz PMA5310 module used in their acclaimed MA500. The Good: it's a beautiful piece, well crafted and appears to be a serviceable layout. The Bad: Only one channel works and there is little information available on the web. Nonetheless, I have found schematics (from acdconline.com in Australia) from which I deduced the link to the Marantz amp module topology. Will have detailed photos to share... The full complement of output power devices (20 total) are on order, but I am holding off on replacing the Elna 10,000 mF 71V caps for the moment. Now I just need patience, but will welcome any advice!