schematics

Bogen DB20 Equalizer Circuit circa 1953

From the October 1953 edition of RADIO ELECTRONICS comes this report on an exceptionally powerful EQ circuit as-found in the…

4 years ago

Argentine Hi-Fi DIY Circa 1958

Many years ago I published this article abt digging for ancient audio ephemera in Buenos Aires.   Reader N. Dinapoli Farina…

9 years ago

RCA Solid State Audio Projects c. 1968

I'd never been particularly interested in learning solid state electronics.  There just didn't seem much point; considering that you can…

10 years ago

DIY Tube Broadcast Console c. 1964

From BROADCAST ENGINEERING Mag, circa 1964, plans by one Robert Tiffany on the design and construction of a low-cost 'standby'…

11 years ago

Suicide Manual

In NYC in the mid-seventies, an electronic-based band arose amongst all the guitar punks, a band that was known as…

12 years ago

RCA BC-2B Recording Studio Console c. 1952

Reader T.F. sent me this scan from AUDIO ENGINEERING c. 1952: the introduction of the RCA BC-2B Console. LEFT: The…

12 years ago

Add Vibrato (?) To Any Tube Amp! (1962)

Download a short article from 1962 by one F.H. Calvert on the subject of adding a vibrato circuit to any…

12 years ago

Interesting Passive EQ circa 1961

Above, a 'distortionless' equalizer circuit circa 1961 as designed by one Carlos Moura.  Separate bass and treble boost functions (2…

13 years ago

1957: Golden Age of Hi Fi (ladies-of), take two

Download a two-page scan of Radio & Television News, August 1957, featuring screen-star Martha Hyer and her DIY audio-hobby. DOWNLOAD:…

13 years ago

Audio Mixing Consoles circa 1959

Langevin stereo console circa 1959 Today: from the "Audio Cyclopedia," Howard Tremaine, 1959: a quick visual survey of professional mixing…

13 years ago