I believe that Headroom still owns the HA-2 design and as such I won't be publishing that schematic, only my revised version. Quick note - both the Van Waarde and the HA-2 schematic are out there if you know where to look, the Waarde is at Headwize (linked above) and owners of the HA-2 know where to find its schematic. So me being the unabashed Pete Millett fan that I am and a former HA-2 owner jumped all over it. The original HA-2 was technically able to do this but not all that well in my opinion. Most notably this involved paralleling the output tubes and increasing the output coupling capacitance to the point where driving low-impedance headphones would be possible. The basic gist of the project was that they had taken the Van Waarde project along with the Wheatfield HA-2 design and started to improve upon the general concept. This really got going in late December of this past year when I got a message from a friend (who shall remain nameless) that they had an abandoned project that I might be interested in picking up. And I did say brief history and I swear I'll try to keep it that way. So really this started years ago, but if I tell the story that way it won't make a bit of sense to anyone other than myself. As of right now the amp is in working condition and headed to Florida for the party that will be CanJam. I'm going to create a thread for this amp since it is my intention at the end of the build to publish the schematic and any relevant details so that anyone who's crazy enough can build this amp.
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