@cscrutinizer
Not many tube preamps can drive headphones directly. Headphones typically have a 32 ohm impedance- that's a bit of a problem for tubes. Its a pretty short list as far as I know; our MP-1 preamp and the microzotl headphone amplifier are the only ones that come to mind. The latter can be used as a preamp. It is based on the 6SN7 and gets excellent comments.
Not many tube preamps can drive headphones directly. Headphones typically have a 32 ohm impedance- that's a bit of a problem for tubes. Its a pretty short list as far as I know; our MP-1 preamp and the microzotl headphone amplifier are the only ones that come to mind. The latter can be used as a preamp. It is based on the 6SN7 and gets excellent comments.