David, I'm so sorry. I didn't realize the impedance issue. I have a very distant memory of a Beard making some nice sounds from a Thiel 3.5. Perhaps it was a different model. Or perhaps more than my memory is distant. Your concern is appropriate.
The Thiel 3.5's have 4 Ohm minimum 4 Ohm nominal impedance load. They are very tube friendly, so long as you have enough (high) power coming from the 4 Ohm tap.
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