Technical

EMI Redd 47 Mic Preamp build

So I was flipping through Recording The Beatles recently and I was reminded that I had yet to make one…

12 years ago

Hi-Gain PA Amplifier Circa 1950

From Radio-Electronics, 1950, comes this circuit by one James Rundo.  Download the article by clicking here: DOWNLOAD: HiGainPA_Amp_1950 Above, the…

12 years ago

Belgian Hi Fi Amp circa 1950

From Radio-Electronics March 1950 comes this piece.  Download a PDF with high-res scans by clicking the link below: BelgianAmp1950

12 years ago

Mechanically-Achieved Audio Time Compression/Expansion

From DB Mag, sometime mid seventies:  a really fascinating discussion of something that I would have guessed was impossible: completely…

12 years ago

Leon Russell’s Direct Box circa 1975

From DB magazine, June 1975: a direct-box that was custom-designed for Leon Russell's studio.  I am a huge LR fan…

12 years ago

Pioneer SR101 ‘Reverbe’ Unit

I picked up the above-depicted Pioneer SR-101 all-tube Stereo Reverb unit for a few dollars at the final flea of…

12 years ago

1949: Build your own Disc-Recorder!

Download a four-page article from RADIO-ELECTRONICS, 4/1949, on the subject of 'build your own disc recorder': DOWNLOAD: DIY_DiscRecorder1949 Above: the…

12 years ago

Single-tube audio oscillator c. 1946

Download a four-page article from RADIO NEWS, November 1946, containing data and plans for constructing a surprisingly simple tube audio…

12 years ago

1961: Five Things

From the 1961 Langevin Catalog, which unfortunately I cannot upload due to massive file size.  Anyone know of a reliable,…

12 years ago

Novel Vacuum Tube / Diode Compressor: 1950

Download a short piece from RADIO-ELECTRONICS, 1950, on the subject of a DIY audio-compressor: DOWNLOAD: DiodeCompressor1950 This promises to be…

12 years ago