[Tubefly]

Has anyone tried swapping out the Hammonds and replacing them with Edcors? I hate to say it this way but I am looking for ways to reduce the initial build costs while trying to maintain the quality of the original design.

Thanks, Alan

[Brinkman]

What Edcors are you thinking of? The type of output transformer needed for a headphone amplifier is not terribly common.

At any rate, I wouldn't skimp on the output transformer. Wide bandwidth and impedance matching are worth paying for in a design such as this where you will be listening very closely.