Unfortunately nether Brad or myself will be able to personally attend this meet
However We are sending the valvecode prototype that Brad demonstrated at the last meet, however upgrades have been done based upon the feedback we received from Local Seattle area Head-Fiers in addition to input from non Local members that were simply reading about the meet.
those of you that had the opportunity to hear the Previous prototype will notice>
(1) more gain to accommodate low sensitivity Headphones in fact all the gain you could want for low sensitivity Headphones, So members that have the AKG-K1000's should bring them by and see if there is enough gain for them, I am sure there would be however
(2)the Impedance selection knob has been expanded from 3 to 6 Posistions allowing a finer adjustment range to accommodate a wider range of Headphone Impedance.
(3) Additional circuit refinements like the addition of my Dyn-O-Bias Dynamically Biased output stage. this Hollow state implementation is done without the addition of additional active devices and thus the valvecode still is an all valve design with no solid state devices used anywhere in the Amplifier.
(4) the tube complement has been changed from the compaction sweep Tubes to the 8 pin Octal 6SN7GT and 6BL7GT thus allowing a wide assortment of 6SN7 and 6BL7 derivatives to be used in ether the Input of the output positions. the rectifier Tube is still the rugged 5U4GB or GZ34 with the 5AR4 as a sub.