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(Created page with "thumb|center|500px|The tube VCOs and other tube circuits. The '''CGS tube VCO''' is a circuit for a 1 volt/oct tube VCO. The expo is based on R...") |
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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: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
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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