I was going through a few of the things my grandfather left for me after he passed and discovered a pair of what seem to be new old stock JAN 6528 tubes (and one non-JAN). Some cursory research showed they could be used for a headphone amp? Tubes are new to me, so would it be worth trying to find someone that could build an amp to use them? I just think it'd be a cool part of his legacy to repurpose something he probably had for his ham setup into something I'd use frequently.