Can I use an ordinary pushpull output transformer as a single ended ultralinear output transformer?
Maybe. It’s cheaper than getting one originally designed for that use, but you do have to consider it as experimental – it may or may not return good results, and you may have irretrievably damaged a working OPT, which may or may not be a tragedy, depending which transformer it was and whether you paid real dollars for it and how many. You can try it, but consider the transformer expendable. Q: What does the “impedance” of my output transformer mean? A: Transformers don’t have impedances, they have impedance RATIOs. This is an important distinction. Transformers transform impedances as a pure ratio. That is, a 4400 PP to 8 ohm transformer makes any load on its secondary look like it’s 550 times bigger to a tube at the primary. An 8 ohm secondary load then looks like a 4400 ohm load at the primary. It also makes a 16 ohm load look like an 8800 ohm load if you hook 16 to it, 2200 if you hook a 4 ohm load to it, and similarly for all values in between. Power tubes have a power output that
