You might want to look at the monos from TAD. I have the TAD 60 2 ch and find it hard to beat for the money.
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Not that I have actually heard them, but I believe your DDD's are a 3 Ohm load, not the typical choice for tube applications. Again, not that I have actually heard them, but the Walcott's are reputed to be the tube amps of choice for such low impedances. BTW, I find the thinking behind the German Physiks most appealling. I'd just love to hear them. Good luck.