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One more irritation ...

... direct coupled amps will drift out of alignment as tubes age or power-line voltage drifts, so unless you re-trim them on a regular basis, or use servo bias circuits, regulators, or other complications, they will usually be operating at off-optimum operating points.

As Mr. Steady posted on the high efficiency forum recently, "To paraphrase Winston Spencer Churchill, 'direct coupled SETs are the worst amps in the world, except for everything else.'" There IS a magic to them, but they are high-maintenance. I currently prefer to spend bucks on a really really good coupling capacitor, and at the highest level on a shunt regulator. YMMV though :^)

Incidentally, the drift problem is IMHO one of the reasons that Jeff (drlowmu) and Dennis (tube wrangler) are so adamant about premium tubes operated at conservative dissipations.

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