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Take the 'rear' tube out, leave the 'front' tube in, turn on the amp and leave it on for 48 hours (no source, just 'on'). Turn off, replace tube, check for hum.
I will try that, thanks. After thinking about it, I remembered I had some huge old cans from the early 80's in my closet. I dug them out and plugged them in just now and the hum is still there but significantly less noticeable. These headphones don't sound very good though so it looks like I'll be on the hunt for a new higher-impedance set. The buying never ends...lol.
I just laughed. When they tell you that headphones and amps/dacs are a hole in your wallet, they don't threaten you. It's a promise. I don't think I've seen anyone stop without going through upgrades.