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Text replacement - " (archived) by Ken Stone, 1999, with permission of the author" to " by Ken Stone, 1999, with permission of the author - archived"
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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
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.
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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 [
'''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
== External links ==
* See René Schmitz [https://www.schmitzbits.de/vtvco.html Vacuum tube VCO] for more info.
* [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
[[Category:CGS
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