Find:
About Me
Blogs
- AC8JO
- Antique Finds of J&J
- Antique Radio Blog
- Arcane Radio Trivia
- Audio Tweak
- Audioklassiks
- Broadcast Law Blog
- BuildLounge
- Classic Receivers
- Coffman Labs Blog
- Confessions of a Part-Time Audiophile
- Duanes Radios
- EEVBlog
- Engineering Radio
- Glowbugs Times
- Glowbugs Web
- Guitar Fool
- Hack a Day
- HeavyDIY
- High on Solder
- Ilektronx
- KN0CK
- MicroSyl
- Nick's Radio Corner
- Old Stock Audio
- Pragmaddux
- Radio Stuff
- Radio Time Traveller
- Richard Sears, Vintage Electronics
- Seventies Stereo
- The Paleotechnologist
- The Signal Path
- Tube Addict
- TubeSound
Friends
Resources
- 901
- Active Equalizer
- amateur radio
- amplifier
- android
- Antique
- antique radio
- Bose
- Bose 901
- Bose Active Equalizer
- Bose Equalizer
- bose repair
- capacitor
- capacitor replacement
- cost engineering
- Craigslist
- eBay
- electronics
- Equalizer
- fried electronics
- GE
- grunow
- grunow 589
- grunow chassis 5-U
- grunow radio restoration
- ham radio
- hf
- hi-fi
- hifi
- HP
- KN0CK
- old radio
- oscilloscope
- overhaul
- philco
- photos
- power supply
- projects
- radio
- rca
- receiver
- repair
- restoration
- RTL-SDR
- RTLSDR
- SDR#
- seattle
- seattle vintage radio repair
- Series 1
- series I
- series II
- series IV
- shortwave
- soldering
- Sony
- Speakers
- speaker spotter
- stereo
- streaming
- t-mobile
- test equipment
- transistor
- transistor radio
- tube
- Tube Amp
- tube radio
- up-converter
- Upconverter
- vacuum tube
- vintage
- vintage ad
- vintage radio
- Westinghouse
- zenith
Categories
Meta
Monthly Archives: December 2015
HH Scott 233 Stereo Integrated Amplifier Overhaul
From the Rain City Audio repair blog: I was lucky enough to get to work on a very nice Scott 233 stereo integrated amplifier. This example was wonderfully well preserved, coming out of a storage unit looking like it had … Continue reading
Posted in Audio, Electronics, Radios and Tubes, Stereo, Vintage
Tagged 233, hh scott, scott, stereomaster, Tube Amp, tube stereo, vintage amp
5 Comments
Service Shortcuts December 1932
Due to a technical problem, this post was initially published with no content on Tuesday, December 29th. Retrovoltage regrets this error. Hints for the service shop, from December 1932’s Radio Retailing: A.V.C. Accessory for Screen-Grid Sets by Joseph E. Soos A … Continue reading
Posted in Uncategorized
Leave a comment
What’s On Your Workbench?
People ask me what kind of gear I use at Retrovoltage and at Rain City Audio for projects. So, here we go: While it’s by no means the best-equipped workbench out there, it has a good mix of lab- and service-grade … Continue reading
Posted in Collections, Commentary, Test Equipment
Tagged atten, audio precision, bk precision, HP, LogiMetrics, photos, repair bench, sencore, tektronix, test equipment, workshop
6 Comments
Assembling Transistor Radios in 1955
Here’s a great documentary short from 1955 showing how portable transistor radios were assembled. It’s super retro! (2:35) Want to learn more about transistors? Just a few years later the US Information Agency produced an 8-minute short film about the … Continue reading
Posted in Collections, Electronics, Vintage
Tagged 1955, 1959, commercial applications, documentary, history, Little Giant, radio, transistor, transistors, US information service, vintage ad
2 Comments
It’s Beginning To Look A Lot Like Christmas
Bring the Sound of Christmas Into Your Home with RCA Victor Radio
Posted in Collections, Commentary, Vintage
Tagged christmas, radio ad, rca victor, vintage ad
4 Comments
Tektronix 575 Mod 122C Curve Tracer Restoration Project – Part 1
A while back I picked up a Tektronix 575 Mod 122C transistor curve tracer from Craigslist and just started digging into it. With some encouragement from reader petepdx, I’ve started actually looking into fixing it up. (Click the photos for a much larger … Continue reading
Posted in Commentary, Electronics, Test Equipment, Vintage
Tagged 575, crt, Curve Tracer, mod 122c, old test equipment, overhaul, restoration, tek, tektronix, transistor, vintage test equipment, water damage
16 Comments
Collector or Bargain-Hunter? There are Craigslist deals out there.
If you’re like me and have a liking for vintage electronics, you’ll know that they turn up in a lot of places. Craigslist tends to be a pretty good spot for radios and even piles of tubes from time to … Continue reading
Posted in Commentary, Test Equipment, Vintage
Tagged 4c250, ghz oscilloscope, kilomegacycle, oscilloscope, tektronix, tektronix 519
7 Comments
Bose® 901 Series IV Active Equalizer #269557 Repaired
From the Rain City Audio Repair Blog: Another Bose® 901 Series IV Active Equalizer came in through the shop for an overhaul recently. This one was a bit unusual, and represents a fairly significant deviation from the published service manual. … Continue reading
Posted in Audio, Bose, Electronics, Projects
Tagged 901, Active Equalizer, Bose, series IV
Leave a comment
Merry Christmas from Retrovoltage!
Radio & Television News, December 1954