Hi everyone!
I'm Hank, I have been lurking here for a while, but have been an audiophile (in the best sense) for nearly 60 years. I am quite comfortable in the world of big vintage gear, owning a number of tube amps from McIntosh, Fisher, Scott, Eico and Pilot; which drive a number of equally vintage speakers. I have an equal number of newer solid state offerings for power hungry speakers. Being a life long hoarder and tinkerer - and having a lot of storage space - does have some advantages.
Until recently headphones have been a secondary option for me, an alternative when I wasn't allowed to crank up my regular systems. I've gone from vintage British e-stats to turn of the century (boy it feels weird to say that) Stax gear to more recent Sennheiser offerings.
This recently changed as a result of the passing of a Head-fi member. His first name was Ira, he lived in Philadelphia, and he died suddenly this past January. Sadly, his widow doesn't know what his forum name was. Anyway, she asked to help restore, if possible, at least some of his headamp collection. Which brought me here. I'm hoping to get some direction on what might be worth putting time and effort into. And I'm hoping to find guidance on where to find any available technical documentation, assuming any exists. Along the way I'll get a glimpse of where head amp technology has been while I wasn't paying attention. I have a pair of Sennheiser HD600's that I'll use for each of the head amps as a start.
I look forward to diving down this rabbit hole and seeing where it leads.