--- title: Telos Alliance Blog Featuring Audio News Events Products & Updates | Vintage Audio Technology description: Vintage Audio Technology | Telos Alliance has led the audio industry’s innovation in Broadcast Audio, Digital Mixing & Mastering, Audio Processors & Compression, Broadcast Mixing Consoles, Audio Interfaces, AoIP & VoIP for over three decades. The Telos Alliance family of products include Telos® Systems, Omnia® Audio, Axia® Audio, Linear Acoustic®, 25-Seven® Systems, Minnetonka™ Audio and Jünger Audio. Covering all ranges of Audio Applications for Radio & Television from Telos Infinity IP Intercom Systems, Jünger Audio AIXpressor Audio Processor, Omnia 11 Radio Processors, Axia Networked Quasar Broadcast Mixing Consoles and Linear Acoustic AMS Audio Quality Loudness Monitoring and 25-Seven TVC-15 Watermark Analyzer & Monitor. Telos Alliance offers audio solutions for any and every Radio, Television, Live Events, Podcast & Live Streaming Studio With Telos Alliance “Broadcast Without Limits” “Love What You Hear” --- [![Magnetic Tape and the Emergence of High-Fidelity Recording | Telos Alliance](https://blogs.telosalliance.com/hubfs/Blogs/Magnetic%20Tape/Magnetophon%20662x260.jpg)](https://blogs.telosalliance.com/the-history-of-magnetic-recording-tape) ## [Magnetic Tape and the Emergence of High-Fidelity Recording | Telos Alliance](https://blogs.telosalliance.com/the-history-of-magnetic-recording-tape) By [The Telos Alliance Team](https://blogs.telosalliance.com/author/telos-alliance-team) on Oct 18, 2017, 12:00:00 PM - [Tweet](https://twitter.com/share) # Magnetic Tape and the Emergence of High-Fidelity Recording In the earliest days of sound recording (late 1880s to 1926), all recordings were made acoustically. That is to say, a recording machine with a large horn with a needle on the other end was set before an orchestra and the vibrations from the needle would “draw” a pattern on a spinning wax cylinder (or later flat disc). If a vocalist was called upon to sing, they would stand before the horn and sing right into it. [Read More](https://blogs.telosalliance.com/the-history-of-magnetic-recording-tape) Topics: [Vintage Electronics](https://blogs.telosalliance.com/topic/vintage-electronics), [Vintage Audio Technology](https://blogs.telosalliance.com/topic/vintage-audio-technology), [Broadcast History](https://blogs.telosalliance.com/topic/broadcast-history) [![Vintage Audio: Shure M67 Mic Mixer | Telos Alliance](https://blogs.telosalliance.com/hubfs/Blogs/FitA%20-%20Shure%20M67/M67%20front.jpg)](https://blogs.telosalliance.com/shure-m67-mic-mixer) ## [Vintage Audio: Shure M67 Mic Mixer | Telos Alliance](https://blogs.telosalliance.com/shure-m67-mic-mixer) By [The Telos Alliance Team](https://blogs.telosalliance.com/author/telos-alliance-team) on Nov 11, 2016, 5:00:00 PM - [Tweet](https://twitter.com/share) # ![Shure M67](https://blogs.telosalliance.com/hs-fs/hubfs/Blogs/FitA%20-%20Shure%20M67/M67%20front.jpg?width=360&name=M67%20front.jpg "Shure M67")Vintage Audio: Shure M67 Mic Mixer Some pieces of broadcast equipment are destined to become classics. The Otari MX5050, Gates Sta-Level and Spotmaster 500 cart machines come to mind. All were rugged, easy to service, and affordable. And so is our current attic discovery, the Shure M67 microphone mixer. The story begins almost 50 years ago, in 1968 when the M67 was introduced. Production continued through 1987. In 1968, many stations were still using portable mixers with vacuum tubes, so an upgrade to solid state was a plus. One of the early footnotes in the history of the M67 was its use in the recording of Woodstock in 1969. [Read More](https://blogs.telosalliance.com/shure-m67-mic-mixer) Topics: [Vintage Audio Technology](https://blogs.telosalliance.com/topic/vintage-audio-technology) [![Vintage Audio: Singer TTG-3 Two-Tone Audio Generator | Telos Alliance](https://blogs.telosalliance.com/hubfs/Blogs/FitA%20-%20Singer%20TTG3/TTG%20front.jpg)](https://blogs.telosalliance.com/singer-ttg3-two-tone-audio-generator) ## [Vintage Audio: Singer TTG-3 Two-Tone Audio Generator | Telos Alliance](https://blogs.telosalliance.com/singer-ttg3-two-tone-audio-generator) By [The Telos Alliance Team](https://blogs.telosalliance.com/author/telos-alliance-team) on Sep 7, 2016, 1:15:00 PM - [Tweet](https://twitter.com/share) # ![Singer TTG-3 Two-Tone Audio Generator](https://blogs.telosalliance.com/hs-fs/hubfs/Blogs/FitA%20-%20Singer%20TTG3/TTG%20front.jpg?width=250&name=TTG%20front.jpg "Singer TTG-3 Two-Tone Audio Generator")Vintage Audio: Singer TTG-3 Two-Tone Audio Generator Many of the items featured in Found in the Attic are familiar staples of the broadcast, test equipment or consumer electronics industries. But sometimes we feature the obscure. This is one of those times, as we revisit a college surplus grab from the 1970s, and look at the [Singer Two-Tone Audio Generator Model TTG-3](http://www.bunkerofdoom.com/lit/singer/ttg3manual.pdf). Part of what makes this device obscure is that it wasn't designed as a stand-alone piece of test equipment. Rather, it was a plug-in component of the Singer Panoramic Model SSB-50 Single Sideband Analyzer System. Since it is a two-tone generator, it could be used for single or two-tone modulation of single-sideband transmitters, intermod distortion tests, harmonic distortion tests, and general troubleshooting. [Read More](https://blogs.telosalliance.com/singer-ttg3-two-tone-audio-generator) Topics: [Vintage Electronics](https://blogs.telosalliance.com/topic/vintage-electronics), [Vintage Audio Technology](https://blogs.telosalliance.com/topic/vintage-audio-technology) [![Vintage Audio: Hallicrafters S-20 'Sky Champion' receiver | Telos Alliance](https://blogs.telosalliance.com/hubfs/Blogs/FitA%20-%20Hallicrafters/S-20%20front.jpg)](https://blogs.telosalliance.com/hallicrafters-s20-sky-champion-receiver) ## [Vintage Audio: Hallicrafters S-20 'Sky Champion' receiver | Telos Alliance](https://blogs.telosalliance.com/hallicrafters-s20-sky-champion-receiver) By [The Telos Alliance Team](https://blogs.telosalliance.com/author/telos-alliance-team) on Jul 19, 2016, 10:29:00 PM - [Tweet](https://twitter.com/share) # ![Hallicrafters S-20 Sky Champion receiver](https://blogs.telosalliance.com/hs-fs/hubfs/Blogs/FitA%20-%20Hallicrafters/S-20%20front.jpg?width=340&name=S-20%20front.jpg "Hallicrafters S-20 Sky Champion receiver")Vintage Audio: Hallicrafters S-20 'Sky Champion' receiver This installment of Found in the Attic examines the Hallicrafters S-20 'Sky Champion' receiver. The 'Sky Champion' line was the company's' mid-priced communications receiver.   Introduced in 1938, the S-20 was replaced by the S-20R in 1939. Since it was in production for less than a year, these receivers are somewhat rare. There are several differences between the S-20 and S-20R. The S-20 primarily used tubes with grid caps, while the later S-20R used newer replacements. Tube lineup for the S-20 includes: 6K7, RF stage; 6L7, 1st detector-mixer; 6J5, HF osc; 6K7, IF amp; 6Q7, 2nd detector-AVC-1st audio stage; 6F6, audio out; 6J5, BFO and 80, rectifier. [Read More](https://blogs.telosalliance.com/hallicrafters-s20-sky-champion-receiver) Topics: [Vintage Electronics](https://blogs.telosalliance.com/topic/vintage-electronics), [Vintage Audio Technology](https://blogs.telosalliance.com/topic/vintage-audio-technology) [All posts](https://blogs.telosalliance.com/all) Blog Search Search ### Recent Posts ## Subscribe *If you love broadcast audio, you'll love Telos Alliance's newsletter. 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