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Author Archives: jwk
HH Scott HHS-20 “Scotsman” Receiver Overhaul
A local repeat customer recently brought in his old HH Scott HHS-20 receiver for an overhaul. It worked a few years ago when he put it away, although not without a few issues of its own, and when he dug … Continue reading
Posted in Audio, Electronics, Projects, Stereo, Vintage
3 Comments
A Surprise in a Re-Stuffed Capacitor
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
Music Minder Automatic Power Controller for Hi-Fi Systems
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 automatic, hi-fi power, music minder, popular mechanics, record player, turntable power
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Would you look at that!
It’s pretty, but this 12BA6 tube has amplified for the last time. Vacuum failure has led to a gas intruding into the vacuum, and it makes a great light show when it’s being tested! As cool as it looks, this would cause … Continue reading
Bad Caps in Everything
I just had a bit of a scare with my Audio Precision analyzer. The 2004-era Dell OptiPlex GX270 which drives the AP hardware decided it would refuse to power up – just flashing the “ON” light for a fraction of … Continue reading
Posted in Computers, DIY, Electronics, Test Equipment
Tagged audio precision, capacitors, motherboard, system one, windows 98
3 Comments
DBX SFX-10
I saw this interesting set of speakers on Craigslist, but they sold quickly before I could investigate. They’re the DBX SFX-10s. There’s a very interesting article about their design in the May 1990 issue of The BAS Speaker, the publication … Continue reading
Posted in Audio, Electronics
5 Comments
Bose® Active Equalizer Test Platform
This project is going to take a while since I’m slammed in the shop, but I’m in the process of converting a Bose® 901 Series I Active Equalizer to a test platform. With sockets for the transistors, and clip connections … Continue reading
Posted in Audio, Bose, DIY, Electronics, Stereo, Test Equipment
Tagged Bose, conversion, Equalizer, sockets, test platform, transistor
3 Comments
“Won’t that ruin the vintage sound?”
Audio as a hobby sits in an interesting place in the world. There are hard numbers and objective measurements made with lab equipment on one end, and on the other end you have the subjective and variable linguistic descriptions assigned … Continue reading
Posted in Audio, Commentary, Electronics, Hi-Fi, Vintage
Tagged amplifier, old stereo, rich, sound signature, stereo, tone, vintage sound, warm
3 Comments
Friday Link Roundup: March 11th, 2016
What’s good this week? Let’s see: Mohammed Samji takes us through a hifi power conditioner supplying electricity to some very expensive B&W speakers. Interesting! [Part Time Audiophile] Break something plastic? There’s a plastic welding kit for that. Looks like it … Continue reading
Posted in Collections, Commentary
Tagged AM, amazon, broadcast, bypass capacitor, dash button, links, plastic welding, power, roundup
2 Comments
Reviewing the Gemtune APPJ PA1501A 6AD10 Stereo Tube Amplifier
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 →