I can't speak for the Dehavilland but everyone that's heard my Aurieges has loved it. Just keep in mind that the impedance on it is quite high, 5,000 Ohms, so you have to be careful about matching amps with it.
It works with just about every tube amp I've ever come across. Most tube amps have a 100K ohm input impedance- no problem. Its just not a concern. The alternative to lower the output impedance of a tube pre is add more tubes or add an output transformer. More tubes is not an option sonically. Ouytput transformers are a great option but they cost.
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