Optonica amplifier recap
Few months ago my son and I, we picked up an Optonica amplifier for his stereo system. Previously, he was using a not so vintage monster receiver from the early …
Replacing speaker selector lamp in Onkyo Integra M-506RS amplifier
My latest addition to the stereo system, an Onkyo Integra M-506RS amplifier, had a speaker # 1 bulb out. After removing top and bottom panels, additional four screws hold the front …
Kenwood KA-7100 amplifier
After taking a short (or long) break from audio equipment, I am sort of back. Recently, I have acquired Kenwood KA-7100 amplifier. One of the channels was cutting out and controls …
Luxman L-85V – rebuilding amplifier boards
About a year or so ago I have purchased two Luxman L-85V amplifiers. Both not working. One was an easy fix as it only needed fuse. About $1.10 later, I …
Upgrading speaker binding posts in Sansui AU-101
The Sansui AU-101 amplifier has very inconvenient way of attaching speakers. Basically, you need speaker wire with a spade connector. The wire is tightened by a screw. It is very …
DIY: LM3875 gainclone amplifier build
Few years back, I have built a BrianGT’s (chipamp.com) LM3875 based gainclone amplifier. It had one small 80VA trafo, crappy enclosure, crooked volume pot and while it sounded OK, it …
Sansui AU-101 amplifier recap
My never ending expansion of audio equipment brought home small Sansui AU-101 amplifier. This is a 2x15W stereo amplifier built between 1973 and 1975. Contrary to all the other silver …