Tag Archives: schematics

DIY Tube Broadcast Console c. 1964

Posted on 04/23/2013 by chris

From BROADCAST ENGINEERING Mag, circa 1964, plans by one Robert Tiffany on the design and construction of a low-cost ‘standby’ broadcast console.  Output amp stage uses my fav line output transformer, the UTC A-25: still unequaled among air-gapped plate:line transformers … Continue reading →

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Suicide Manual

Posted on 04/16/2013 by chris

In NYC in the mid-seventies, an electronic-based band arose amongst all the guitar punks, a band that was known as much for their confrontational post-beatnik vocals as for the strange and intense sounds that emanated from their famously homemade electronic … Continue reading →

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RCA BC-2B Recording Studio Console c. 1952

Posted on 08/10/2012 by chris

Reader T.F. sent me this scan from AUDIO ENGINEERING c. 1952: the introduction of the RCA BC-2B Console. LEFT: The BC-2B incorporated the RCA MA-11241 dual mic pre-amp unit; a two-stage circuit, each channel used a single 12AY7 for, I … Continue reading →

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

Posted on 07/26/2012 by chris

Download a short article from 1962 by one F.H. Calvert on the subject of adding a vibrato circuit to any vacuum-tube audio amplifier: DOWNLOAD: Vibrato Above, the schematics.  These are not plans for a stand-alone device: rather this circuit (the … Continue reading →

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Interesting Passive EQ circa 1961

Posted on 03/08/2012 by chris

Above, a ‘distortionless’ equalizer circuit circa 1961 as designed by one Carlos Moura.  Separate bass and treble boost functions (2 frequencies each) and bass and treble loss cut.   I do not know the range, frequencies, or insertion loss.  Can … Continue reading →

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

Posted on 03/07/2012 by chris

Download a two-page scan of Radio & Television News, August 1957, featuring screen-star Martha Hyer and her DIY audio-hobby. DOWNLOAD: Martha Hyer 1957 Radio TV News Hyer is shown above in the midst of assembling her PERI 50, a mono … Continue reading →

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Audio Mixing Consoles circa 1959

Posted on 02/20/2012 by chris

Langevin stereo console circa 1959 Today: from the “Audio Cyclopedia,” Howard Tremaine, 1959: a quick visual survey of professional mixing consoles in service in 1959.  A PS Dot Com reader turned me on to the “Audio Cycolopedia”; many copies of … Continue reading →

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AWA (Amalgamated Wireless Australasia) Broadcast Equipment

Posted on 02/06/2012 by chris

Download a 24pp pdf with schematics and technical information regarding all AWA-brand vacuum-tube broadcast audio amplifiers circa 1967: DOWNLOAD: ABCstudioEquipment Big thanks to PS dot com reader E. Lorden.  E. lives in Australia and has provided us with extensive schematics … Continue reading →

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Audio Anthology: Collected Hi-Fi articles from AUDIO ENGINEERING in the 1940s

Posted on 01/29/2012 by chris

PS dot com reader Paul R. was kind enough to send us a scan of “Audio Anthology,” (ed. C.G. McProud) a 124pp softcover published in 1950.  “Audio Anthology” (hf. ‘AA’) is a collection of project-construction articles aimed at hi-fi (rather … Continue reading →

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The Williamson Amp, part one

Posted on 01/09/2012 by chris

The original Williamson hi-fi amplifier schematic as published in “Wireless World” magazine (UK) May 1947.   The Williamson amplifier is considered one of the earliest hi-fidelity audio amplifier designs.  It is certainly one of the most popular audio circuits ever … Continue reading →

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