The Fisher Receiver I am using sounds good to me. I believe the preamp circuit is used to amplify the headphone jack. The tubes are usually NOS German.
However if you want a super headphone amp I will admit that my modern but now disgraced SinglePower is much much better. If you audition a quality dedicated headphone amp I bet you will be bowled over if it sounds anywhere as good as the one I have. (Despite the bad behavior of it's maker.)
I must apologize I do not know a current tubed integrated as specified.
I wonder given the nature of this industry if you can ask for a custom piece can be made for you. Mapletree Audio in Canada makes preamps, amps, integrateds and Headphone amps usually made to order. He seems to be flexible but I haven't any idea how much it would cost.
However if you want a super headphone amp I will admit that my modern but now disgraced SinglePower is much much better. If you audition a quality dedicated headphone amp I bet you will be bowled over if it sounds anywhere as good as the one I have. (Despite the bad behavior of it's maker.)
I must apologize I do not know a current tubed integrated as specified.
I wonder given the nature of this industry if you can ask for a custom piece can be made for you. Mapletree Audio in Canada makes preamps, amps, integrateds and Headphone amps usually made to order. He seems to be flexible but I haven't any idea how much it would cost.