Technical

Bell Labs’ Electro-Mechanical ‘Speech Synthesizer’ circa 1951

**update 07.09.21 - audio clip added! see below! you can now HEAR this monstrosity!** Download a 4PP article (+advert) from…

4 years ago

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

Excellent Larry Scully / Bert Whyte interview from AUDIO 1969

Download the complete 5-page Bert Whtye interview of Larry Scully from the 11.69 issue if AUDIO: DOWNLOAD: LarryScully_BertWhyte_Interview_AUDIO_1169 As longtime…

7 years ago

“Microphones And Their Placement” from ‘The Aerovox Research Worker’ 1958

download a 6pp article on "Microphones And Their Placement" as published by the Aerovox Capacitor Corporation, 1958: DOWNLOAD: Microphones and…

7 years ago

Lost to time: Check out the Fairchild 627 Equalizer circa 195nvr

Apologies for the poor image quiality; these came from the research department of a long-gone British broadcast-gear-manufacturer via some dampish…

8 years ago

The Fisher PR6 Phono Preamp Circa ’55

Been working on developing a 'NEW' octal -based RIAA preamp so this caught my eye in a giant pile of…

8 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

The Fairchild Model 605 Stereo Tube Phono Preamp c. 1959

How y'all  doing on this frigid day in March,,,  so listen, srry abt not posting much new material this past…

10 years ago

The 1959 Ikegami-Tushin Limiter Inspired by the RCA BA6A

Reader S. Komiya recently contacted us with some information regarding the Ikegami-Tushin limiting amplifier, an RCA BA-6A inspired piece that…

10 years ago

An DIY Tube Mixer Project c.1954

Today's article scan, again via reader Bill W., was written by one John S. Carroll and originally appeared in RADIO…

10 years ago