Thanks, it is a great portable amp. Ugly but built to last (bit like the HD25s themselves maybe ?) & made a few miles from where I live in the UK by Graham Slee. I've had it for years & only need to change the battery every 3 months or so.
On the subject of pads I'm also interested in trying the new HD25 Aluminium pads. I hope they might give the sound quality of the pleather pads but with improved comfort. Has anyone tried them on the standard HD25-1 yet ?
They're a bit expensive to try on a whim.