CGS tube VCO: Difference between revisions

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Line 8: The ECC88 and another similar though not identical unmarked tube (6ES8/ECC189?) worked in the grounded grid amp position. Others may. I was planning to use the second triode in this tube to drive the second VCO, but found I had a lot of cross talk from VCO 1 to VCO 2, so I abandoned the idea. As there did not appear to be any crosstalk in the opposite direction, it is most likely a layout problem. René's Neon VCO uses this second triode to amplify the output of the VCO. Initially my VCO was wired as per [https://web.archive.org/web/20170512111005/http://www.cgs.synth.net~~:80~~/tube.html Eric Barbour's VCO design], and the triode amp was particularly good, with the drive control allowing adjustment between triangle and rectangle output. When the grounded grid amp was added to the VCO, this configuration was not as effective, leaving me with more of a spike waveform. Chances are this could easily be fixed, but I did not pursue it at the time as I wanted to use the same tube for both grounded grid amps. It may have even been down to a wiring error, or the decoupling capacitor I used being too small. The 5696 is a thyratron tube. On this tube I used a socket with a tube shield. This blocked interference from both magnetic and light sources. Line 18: I have had it operating across a range of at least six octaves, and it tracked my Roland 100M VCO perfectly. This, and all of my other tube modules run off a separate power supply based on [~~https://web.archive.org/web/20171001113317/http://www.cgs.synth.net:80~~[Audio synthesis via vacuum tubes/Power supplies for tube synthesizers\|Eric's Barbour's PSU]] design]. '''Note: 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 synthesizer. Some experience with tube electronics is highly recommended.''' == CC-BY-NC == Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work. == See also == * [[Audio synthesis via vacuum tubes/Tube VCO\|Tube VCO]] * [[CatGirl Synth#The CGS modules\|The CGS modules]] * [[CGS parts FAQ]] == References == ''[https://web.archive.org/web/20171001113317/http://www.cgs.synth.net~~:80~~/ 1 V/oct Tube VCO]'' ~~(archived)~~ by Ken Stone, 1999, with permission of the author - archived == External links == * See René Schmitz [https://www.schmitzbits.de/vtvco.html Vacuum tube VCO] for more info. * [https://web.archive.org/web/20170512111005/http://www.cgs.synth.net:80/tube.html Audio Synthesis via Vacuum Tubes] by Eric Barbour * [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc. [[Category:CGS ~~modular~~tube modules]]