Thank you Frank, I did open the page from the address bar and found the following info about Alex's balanced output design for the APL 3910:
"Unlike all of the available Balanced output machines using a simple Op Amp for Single Ended to Balanced conversion, or the even more complicated designs called "true balanced" using twice more components on the signal path, the new APL Hi-Fi Balanced Output is actually giving you the sound quality of a Single Ended Triode drive. The actual phase splitting is done by the secondary windings of the output transformer while driven from the same Single Ended 6H30 Tube stage. This component-less Balanced output design gives you the Ultimate sonic performance with all the benefits of Single Ended Designs. . . "
The modification costs a modest $249. I am not qualified to comment on the engineering merits of this solution, but if it indeed it worked, it would deliver the sonic benefits of a traditional balanced design at a fraction of the price. Any comments from Alex, Dan, and any Agoners with either qualified EE knowledge or listening experience of similar designs will be appreciated.
"Unlike all of the available Balanced output machines using a simple Op Amp for Single Ended to Balanced conversion, or the even more complicated designs called "true balanced" using twice more components on the signal path, the new APL Hi-Fi Balanced Output is actually giving you the sound quality of a Single Ended Triode drive. The actual phase splitting is done by the secondary windings of the output transformer while driven from the same Single Ended 6H30 Tube stage. This component-less Balanced output design gives you the Ultimate sonic performance with all the benefits of Single Ended Designs. . . "
The modification costs a modest $249. I am not qualified to comment on the engineering merits of this solution, but if it indeed it worked, it would deliver the sonic benefits of a traditional balanced design at a fraction of the price. Any comments from Alex, Dan, and any Agoners with either qualified EE knowledge or listening experience of similar designs will be appreciated.