Tag Archives: capacitor

A Surprise in a Re-Stuffed Capacitor

Posted on October 18, 2016 by jwk

I was recently re-stuffing some capacitors for a radio. It’s not something I do often, but I’ve accumulated a pile of pulled vintage caps over the years so I have some on hand if a customer requests the most detailed … Continue reading →

Posted in DIY, Electronics, Radios and Tubes, Vintage | Tagged , , | 3 Comments

How to Read Capacitor Codes

Posted on January 24, 2016 by jwk

I ended up with a massive stash of mil-spec CDE Mica caps recently, and was searching for a refresher on decoding their military part numbers like “CM05FD221GP3”, since the caps came marked for their values but not their voltage ratings. … Continue reading →

Posted in Commentary, DIY, Electronics | Tagged , | 1 Comment

Bose® 901 Series IV Active Equalizer #221114 Repaired

Posted on December 3, 2015 by jwk

From the Rain City Audio Repair Blog: Another Bose® 901 Series IV Active Equalizer came through the shop, this one serial #221114. It’s owner reported that it had lost one channel, so it was clearly due for an overhaul. It … Continue reading →

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

Can you say high ESR? [dead cap]

Posted on June 11, 2015 by jwk

That’s right, 35 Ohms ESR. No surprise, every MIEC cap I’ve ever seen has been garbage.

Posted in Commentary, Electronics, Photos | Tagged , , | Leave a comment

Bose® 901 Series VI Active Equalizer #199732 Repaired

Posted on February 20, 2015 by jwk

Cross-posted from the Rain City Audio Repair Blog: A first for my shop, I recently worked on a Bose® 901 Series VI Active Equalizer! These are considerably newer than the Series I-IV that typically come through the shop, although they’re … Continue reading →

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

Bose® 901 Active Equalizer Series I #17118 Repaired

Posted on February 2, 2015 by jwk

Cross-Posted from the Rain City Audio Repair Blog: This Bose® 901 Active Equalizer came in through the shop for the standard overhaul service. It was showing its age, as most of these equalizers from Series I and II will do … Continue reading →

Posted in Audio, Bose, Electronics, Photos | Tagged , , , , , | Leave a comment

Bose 901 Series 1 Active Equalizer #46453 Repair

Posted on December 22, 2014 by jwk

Cross-posted from the Rain City Audio Repair Blog: Another Bose® 901 Series I Active Equalizer came through the ship, Serial #46453. It came in with a variety of issues, just not sounding like it used to, and the owner requested … Continue reading →

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

EICO Stereophonic Integrated Amplifier HF-81 Repair

Posted on November 7, 2014 by jwk

From the late ’50s, I had this nice example of an EICO HF-81 amplifier come through my shop. These are nice little stereo amplifiers with a built-in phono pre-amp and RIAA equalization and feature about 14W of power output per … Continue reading →

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

Marantz 2270 Stereophonic Receiver Overhaul

Posted on October 26, 2014 by jwk

I just had a great stereo receiver through the shop for repairs, the Marantz 2270. It’s the big brother to the Marantz 2245 I had through the shop a little while ago – mostly the same front-end circuitry, but with … Continue reading →

Posted in Commentary, Photos, Vintage | Tagged , , , , , , | 1 Comment

Harmony H500 Solid State Guitar Amplifier Repair

Posted on October 10, 2014 by jwk

And now for something a little different, this time it’s a vintage guitar amplifier: the Harmony H500. The owner sent it to the shop out of the cabinet to be serviced since it quit putting out any sound. It’s a … Continue reading →

Posted in Audio, Electronics, Projects, Vintage | Tagged , , , , , , , , | Leave a comment