Tag Archives: equalizers

Forgotten 70s Pro Audio maker Gately Electronics

Posted on 02/10/2013 by chris

Above: Gately’s Stereo Briefcase Mixer circa 1970. Gately Electronics was a Pennsylvania-based pro-audio manufacturing and importation/ distribution operation which seems to have operated between 1968 and 1975.  I often noticed adverts for their EM7 mixer in the old AES journals; … Continue reading →

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Cinema Sound Circa 1953

Posted on 04/05/2012 by chris

Today: some random bits+bobs of Sound-For-Film technology of the early 1950s.  Above: the All-New JBL Theatre Sound Systems, which claim to offer the higher-fidelity needed to properly reproduce the newly-available magnetic soundtracks that were being used in 35mm film at … Continue reading →

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Pultec 1977 Full-Line Catalog

Posted on 03/25/2012 by chris

Download the complete twelve-page 1977 Pultec outboard audio equipment catalog: DOWNLOAD: Pultec-1977_catalog Units covered, with text, specs, and photos, include: Pultec EQH-2, EQP-1A3, and MEQ-5 equalizers; Pultec HLF-3c and HLF-26 filters; Pultec SP3 and MH4 mixers. Until I saw this … 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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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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UPDATE: Vacuum Tube Program EQ project – Part 2

Posted on 06/04/2011 by chris

The vacuum-tube powered program EQ that I described in this previous post is nearly complete.  This thing has sat on the shelf for a while, as it was a little daunting dealing with all those parts inside a 17x4x3 chassis.  … Continue reading →

Posted in Custom Fabrication, Technical | Tagged , | 2 Comments

A Few Interesting DIY Audio Projects c. 1955

Posted on 05/28/2011 by chris

Circuit for a simple bass/treble parametric equalizer that uses no inductors.  Could be  a useful piece.  Not sure if 250k/500k dual pots are still available?  Since I have still not finished building the last tube EQ project that I described, … Continue reading →

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Pro Audio hardware of the early 1950s

Posted on 05/18/2011 by chris

The General Electric (GE) BA-5-A Limiter Continuing our review of the first two years of AUDIO magazine, today we will look at some of the more interesting bits of pro audio kit in evidence during 1954/1955.  AUDIO magazine had just … Continue reading →

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Orban Audio Processors of the 1980s

Posted on 03/12/2011 by chris

Download the four-page circa 1984 Orban ‘condensed catalog’: DOWNLOAD: OrbanCondCatalog Photos and descriptions (no specs) of the following models: Orban 111B reverberation; 245F stereo synthesizer; 418A stereo compressor/limiter; 424A Gated compressor/limiter/De-Esser (i.e.,  ‘make-it-as-loud-as-the-FCC-will-allow’ box); 516EC 3-channel De-Esser; 526A De-esser; 622B … Continue reading →

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Fostex ‘Personal’ Outboard Equipment of the 1980s

Posted on 02/28/2011 by chris

Download fourteen-pages of original product information regarding FOSTEX’ “Personal Multitrack” outboard-equipment line of the 1980s: DOWNLOAD: Fostex_Outboard_Gear_1986 Included in this download:  “Echo Buss Vol II, Take 1,” a FOSTEX newsletter to pro-sumer users of the 80s.  Plus 2-side product sheets … Continue reading →

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