Find:
About Me
Blogs
- Antique Radio Blog
- Arcane Radio Trivia
- Audio Tweak
- Audioklassiks
- BuildLounge
- Classic Receivers
- Coffman Labs Blog
- Confessions of a Part-Time Audiophile
- EEVBlog
- Engineering Radio
- Glowbugs Times
- Glowbugs Web
- Guitar Fool
- Hack a Day
- HeavyDIY
- High on Solder
- Ilektronx
- 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
- AM
- amplifier
- Antique
- antique radio
- audiophile
- Bose
- Bose 901
- Bose Active Equalizer
- Bose Equalizer
- bose equalizer repair
- bose repair
- capacitor
- capacitor replacement
- cost engineering
- Craigslist
- eBay
- Equalizer
- fried electronics
- GE
- General Electric
- grunow
- grunow 586
- grunow 589
- grunow chassis 5-U
- grunow radio restoration
- ham radio
- hf
- hi-fi
- HP
- KN0CK
- laptop
- LCD
- LF-116
- old radio
- oscilloscope
- philco
- photos
- power supply
- projects
- radio
- rca
- rebuild
- repair
- replacement
- restoration
- RTL-SDR
- RTLSDR
- SDR#
- seattle vintage radio repair
- Series 1
- series I
- series II
- series IV
- shortwave
- soldering
- Sony
- Speakers
- speaker spotter
- stereo
- stromberg-carlson
- test equipment
- transistor radio
- tube
- Tube Amp
- tube radio
- up-converter
- Upconverter
- vacuum tube
- vintage
- vintage ad
- vintage radio
- Westinghouse
- zenith
Categories
June 2023 S M T W T F S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Meta
Tag Archives: hf-81
EICO Stereophonic Integrated Amplifier HF-81 Repair
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
DIY Replacements for Vintage Couplets and Printed Electric Circuits
Starting in the ’50s, they’d figured out how to start miniaturizing components. “Couplets” and “printed electric circuits” started showing up in equipment around then. These components were combinations of several resistors and capacitors in a single package. Like most components … Continue reading
Posted in DIY, Electronics, Ideas, Vintage
Tagged centralab, couplet, crl, eico, hf-81, pc-191, printed circuit, printed electric circuit, Sprague, tc-24, vintage circuit
Leave a comment