Audio synthesis via vacuum tubes/Tube VCF (view source)
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== Background ==
Since you are reading this article, we have to assume that you read the previous articles dealing with the all-tube VCA and the VCO. Inevitably, people want to pursue subtractive synthesis. Equally inevitable, they will expect the same old paradigms and sound effects, just translated into the tube domain. So, I've worked up a very simple (too simple, according to the uninformed) bandpass filter which can be voltage controlled.<ref name="btatv">[https://web.archive.org/web/20111001171340fw_/http://cgs.synth.net/tube/vcf.html The basic VCF]
In this case, we have to start literally from scratch. The very idea of a voltage-tunable filter was alien until Moog and Buchla came along. Pioneer work, such as that of Herbert Eimert at Cologne's Electronic Music Studio or Louis and Bebe Barron on the soundtrack of the film Forbidden Planet, involved some electronic filters. These commercial bandpass filters were usually large rack-mounted devices, tuned only with a manual knob. And the RCA Mark I and Mark II synthesizers at Columbia University had automated filter controls; but sweeping the filter during the note was difficult. One had to revert to twisting a knob, while the tape ran. So much for the automatic age. Indeed, when the first Moog instruments appeared, the users discovered the weird novelty of the "woow" effect of a swept BPF. It was radical, and became the stereotype of synthesized music (which it still is today).<ref name="btatv"/>
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== Warning ==
This circuitry is intended for the more advanced builder. Because high voltages are used, a shock hazard exists. We do not recommend that the novice DIY musician try to construct this
All these projects and designs should be considered dangerous if not lethal if not used safely. When working on projects based on these designs, use extreme care to ensure that you do not come into contact with mains AC voltages or high voltage DC. If you are not confident about working with mains voltages, or high voltages, or you are not legally allowed to work with mains voltages, or high voltages, you are advised not to attempt work on them.
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== External links ==
* [http://metasonix.com/ Metasonix]
* [https://www.modwiggler.com/forum/viewforum.php?f=13 Metasonix] subforum at Mod Wiggler Forum
[[Category:Vacuum tube synthesizers]]
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