Category Archives: Hi-Fi

Music Minder Automatic Power Controller for Hi-Fi Systems

Posted on August 24, 2016 by

Mixed in with some other gear I’m servicing, I found this old Music Minder power box. It’s not all that obvious what it’s for at first glance! Some digging around found an explanation in the June 1958 issue of Popular … Continue reading →

Posted in Audio, Electronics, Gadgets, Hi-Fi, Vintage | Tagged , , , , , | Leave a comment

Reviewing the Gemtune APPJ PA1501A 6AD10 Stereo Tube Amplifier

Posted on August 17, 2016 by

I recently picked up an interesting little tube amp via a group buy on Massdrop, the Gemtune APPJ PA1501A stereo tube amplifier. Try saying that three times fast! It’s a cute little single-ended stereo tube amp using a pair of 6AD10 … Continue reading →

Posted in Audio, Commentary, Electronics, Hi-Fi, Stereo, Toys | Tagged , , , , , , | 12 Comments

Bose® 901 Series VI #181070 Repair

Posted on August 12, 2016 by

From Rain City Audio: This Bose® 901 Active Equalizer, Series VI, came into the shop recently. These are some of the most recently produced Active Equalizers, although they’re still potentially a few decades old at this point in time. This … Continue reading →

Posted in Bose, Electronics, Hi-Fi, Stereo, Vintage | Tagged , , , , , | Leave a comment

Bose® 901 Series II #65097 Overhaul

Posted on August 8, 2016 by

This Bose® 901 Series II Active Equalizer, #65097, just came through the shop for an overhaul. It worked briefly, but failed quickly on its original components. Nothing that an overhaul can’t take care of! This particular unit had its three … Continue reading →

Posted in Audio, Bose, Electronics, Hi-Fi, Stereo, Vintage | Tagged , , , | Leave a comment

Phase Linear 2000 Upgrade and Overhaul

Posted on July 3, 2016 by

From the Rain City Audio Repair Blog: I recently got to work on another Phase Linear 2000 pre-amp. These well regarded components are a fantastic part of any stereo system with their high output rating, multitude of inputs and outputs, … Continue reading →

Posted in Audio, Electronics, Hi-Fi, Stereo, Vintage | Tagged , , , , | 1 Comment

Bose® 901 Series II Active Equalizer #66380 Repair

Posted on May 2, 2016 by

From Rain City Audio: This Bose® 901 Series II Active Equalizer #66380 came through for an overhaul just recently. The owner in California reported that he got these from his father, and the equalizer was sending only the right channel … Continue reading →

Posted in Audio, Bose, Electronics, Hi-Fi, Vintage | Tagged , , , , | Leave a comment

Bose® 901 Series IV Active Equalizer #265335 Overhaul

Posted on April 28, 2016 by

From Rain City Audio: This Bose® 901 Series IV Active Equalizer, #265335, just came through the shop for an overhaul. It’s owner bought this equalizer as a part of getting his Bose® system back up and running and sent it … Continue reading →

Posted in Audio, Bose, Electronics, Hi-Fi, Projects, Vintage | Tagged , , , , | Leave a comment