In Reply to: Pondering DHTs for headphone use posted by KG4NEL on January 5, 2016 at 06:06:24:
DC on the filaments is a must have.
Beyond that, you want some flexibility with the output transformer, but more likely the ability to switch between 2, 4, and 8 Ohms. You do not want an output transformer with a really high impedance tap for driving headphones, as none of the headphones on the market are going to want 3500mW off a 100 Ohm tap (too much power, too much noise).
An 8 ohm secondary is likely desirable for both your 250 Ohm headphones and power hungry planars.
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Follow Ups
- RE: Pondering DHTs for headphone use - Caucasian Blackplate 10:20:31 01/05/16 (0)