I just finished my headphone amp that I have been contemplating since
I had you guys come over for a listen a while back. I could not use
the 26 tubes as they are a little noisy for headphone use and the
battery supply is not really realistic for a sale-able product.
Anyway, it is a OTA (One Tube Amp) not counting the rectifier tube of
course. It uses a Lundahl step-up transformer as the input stage and
an Emission Labs 20B tube for the output then to an Elecra-Print out
put transformer. It is pretty simple but to get it right took a lot of
time because the noise on a 300 ohm output tap is much higher than for
an 8 ohm tap. There are additional 32 and 75 ohm sockets at the rear
of the unit. I did not want them on the front as I will be using 300
ohm headphones and this will be my personal unit as well as a "show"
piece. I am planning to take it to the RMAF in October.
Let me know what you think.
Tony in Corrales