I managed to find a pair of NEW "open box" HE-5LE's!!
Arrived Friday; I have done a bit of casual listening from the headphone output of my Marantz SA8004. The Marantz can drive them to moderate levels - but no more (not knocking the SA8004, it's not intended to be a 'phone amp). Even with less than satisfactory amplification the 5LE's sound very, very good, the tonal balance and speed are where I expected them to be.
I'll need to DIY an impedance matching box; will run them off of the 16 ohm tap of my tube amps, likely with a 30 ohm resistor paralleled. Hoping that I won't have to chase hum, I use AC heating on the DHT filaments (DIY push-pull 6B4G amps; 6B4G = 6.3v filament 2A3).
I was seriously disappointed when the 5LE's were disco'd, my finances had more important priorities at the time. I would imagine its sales were cannibalized from both ends, the mid-budget folks moving down to the easier to drive HE-500 while the folks with the financial wherewithal to drive them went up to the HE-6. Too bad, kind of left a mid-budget hole for DIY types.
Glad I was able to score a pair "new"!