High end Class D amps?
@jaytor Tube buffers are clearly the way to go. https://atm-audio.com/class-d-amplifier/ https://vtvamplifier.com/product/vtv-amplifier-monoblock-purifi-audio-1et400a-amplifier-with-vtv-vacuum-tube-buffer/ |
Problems with any amps shouldn’t be fixed by using even more feedback as a fix, it’s a added by the best designers to clean thing up a little and usually just local not global in an already well designed amp. All the greatest amp designers say it. An amp should be reasonably good spec’d, and to use it just as a clean up tool. And the preference with the best is to use "local feedback" only by the best designers. Not global as being talked about here, and then even including the Class-D output filter in the global loop, what next throw the speaker wire and the speaker in the loop as well, like Trio/Kenwood tried all those years ago, utter sterilized disaster sound. And using tube buffers with the capacitor coupling that’s needed. Is just colorized HF coverup softening job for the more serious Class-D sound problem. Cheers George |
@twoleftears - I am thinking about trying an input buffer using tubes. I don't think I would consider using the Korg NuTube like ATM does. This is a pretty high-distortion device - specifically designed to add distortion for synthesizer special effects. It also has a bad reputation for microphonics, and is hard to swap in and out. The 6DJ8/6922 tube that VTV uses is much better, but I'm not sure it's the ideal tube to use with the relatively low voltages I have available (approx +/-65v if I use the main supply for the Purifi module). I don't want to add another high voltage supply to drive a tube section, although I could consider a DC-DC converter as part of the buffer board design if I have to. At any rate, I'd prefer to avoid the hassles of tubes, so I'm going to see what's possible with various solid state approaches first. |
George - you obviously aren't interested in class D, so why do you keep bothering to post on this and other class D threads? Really, you need to look a bit deeper sunshine, before ragging on someone. https://forum.audiogon.com/posts/2062498 |
