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Use DHTs

195.93.21.66

If you want the best sound, I (and others) would suggest using directly heated triodes. There's a bit of an art to chosing and using them, but they don't have to be a fright for the constructor. You need a good DC supply for each tube (current source best), and to get the best out of them a 100k stepped attenuator on the input and a nice Lundahl (or other) transformer on the output. Virtually nothing in all audio is better than or even as good as this. But even better is to get a differential DAC like the RAKK DAC and put it straight into the grids of a differential DHT stage, with 75 ohm resistors from each leg (+ and -) to earth before the grid stoppers. That's astounding, and not too expensive at all.

For the DHT think 12A, 01A, 26 globe, any of those. One of the least microphonic is probably the VT-67. You need a very dead chassis that doesn't ring at all, but if you use DHTs in differential rather than SE you should be fine. Transformer out gives you the choice of SE or balanced to the amp. If you have a push pull amp it's useful to change it to balanced operation and use a shunt attenuator which you can easily build yourself with really good quality resistors. Kevin Carter can help you out with all this on the K&K forum - he has a 26 line stage and information on all the right Lundahls, plus of course the RAKK DAC which is extremely detailed and clean sounding - a real joy.

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