Hi , I just acquired a Stax SR3 and SRD-5 on eBay so I'm joining the Head-Fi club now. :) Unfortunately the "works great" e-Bay headphones do so only for the first 3 minutes or so and then the left ear starts slowing fading down in volume until the balance control on my preamp needs to eventually end at full rotation after about 10-15 minutes.
I've tried pumping high volume pink noise through it overnight and that only made it sound distorted when I first tried it in the morning and then it faded out again.
Is this a common problem? I'll likely change out the capacitors in the SRD-5 but I suspect the fading is from the SR3's.
Any suggestions from the vintage Stax guru's?