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Section 2-29 of: http://nwavguy.blogspot.com/2011/07/o2-design-process.html http://nwavguy.blogspot.com/2011/07/o2-design-process.html And the entire article

by VLM 11y ago

Section 2-29 of: http://nwavguy.blogspot.com/2011/07/o2-design-process.html http://nwavguy.blogspot.com/2011/07/o2-design-process.html And the entire article at: http://nwavguy.blogspot.com/2011/05/virtual-grounds-3-channel-amps.html http://nwavguy.blogspot.com/2011/05/virtual-grounds-3-channe... Its easy to make something that amplifies, but he's trying to make something that provides specs maybe 10x to 10000x better than human hearing can detect, which is much harder. You can build something that outputs 0.1% THD and you won't be able to hear it, but he wants (wanted?) to build to 0.001% THD and he's got the rather expensive test equipment required to prove it. JDS labs sells a PCB for less than the cost of shipping (you'll spend more on UPS than on the board) or a full parts kit for $60. This has been around for years and I've been tempted but haven't built one. I just checked JDS and its still in production and in stock. Being CC- licensed there are probably other places to get PCBs and kits.

keithpeter 11y ago
"Let’s take a quick detour and look at vibration damping. Vacuum tubes, and certain components in very high gain circuits like phono preamps, can be “microphonic”—vibrations can affect them in audible and measurable ways" OK, I'll do the reading (verbose-ness!). The quote above makes a degree of sense - I can remember valve based consumer electronics and having fun with the microphonics. Dad used a piece of dowling with a grommet on the end to check for valves that 'rang' so he could replace them.