24.18.227.0
In Reply to: RE: So many 300B schematics...which one? posted by Audiodyssey on October 03, 2009 at 15:05:00
If you want to hear "a VERY good example of the SET philosophy" you will need VERY good transformers. If you also want powerful bass, the transformers will need to have plenty of inductance, especially if you use series feed. (I think most here know I am generally an advocate of parallel feed...) Such transformers will be pretty large and heavy, but neither price nor weight will provide a promise of excellent performance. And sadly, excellent measured performance is not a guarantee of excellent subjective performance.
The next most important thing is the driver stage, in my opinion. I strongly advocate a simple, linear driver with large voltage headroom. Usually that means a single triode with a high plate voltage and a high load impedance (choke/transformer, or current source).
These two things will go a long way towards achieving your goal. I would further suggest you use as few other components and complications as you can.
Finally, especially for series feed, the power supply must be clean and able to handle the signal current fluctuations. That means really good capacitors at the output of the supply.
There are many refinements to these ideas, but too often we get caught up in the refinement and lose sight of the basics. So I would discourage anyone from getting complicated before they have experience with a simple, well thought out design.
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