Here is an Alpine H701 sent to me to be upgraded.
Upgrades will be basic. Just replace all caps in the signal path and all op amps.
Parts choice are: JRC NJM4560 Opamps replaced with Burr Brown OPA1642 and various E-caps replaced with Nichicon FW, Elna Silmic II and Panasonic FM.
Processor on the operating table:
Top cover removed. Digital board on top:
Digital board removed to reveal analog section underneath:
Analog/PS main board removed from bottom chassis:
An hour later, all parts to upgrade are removed and PCB cleaned:
New op amps (OPA1642 SOIC) in place:
Replaced 0.47uF e-caps with Epcos naked film. I have no idea wy manufacturers still make e-caps lower than 1uF when film and ceramic can be had for much better performance. Cost?:
Overview of board. All caps that aren't green are the upgrades :
Closer views of the components:
Page updated and copyright R.Quan © 19 Aug 2012.