https://www.thomann.de/gb/beyerdynamic_dt100ohrpolstervelour.htm?sid=784130711c2ae3922a3c4f58e787be8b

  I had a N6330/99, see this post:   http://www.head-fi.org/t/371753/vintage-philips-n6330-sextett-look-alike-made-in-austria-by-akg/15#post_7237643   Clearly a AKG.

  Oops, you're right, sorry. Didn't look at the actuel post, just did a copy/past from my bookmarks.

  http://www.head-fi.org/t/279905/taking-the-k240-sextett-apart-step-by-step

GMP 400 and 450 Pro are now on Massdrop.

  Which one will sound  best on the basic ZMF?

  Ehm, the K270 Playback is a closed headphone.....

  This needs an update:   Philips N6330 MP & LP (Sextett made by AKG) K 270 Playback K 240 Sextett LP K 240 Sextett MP K-400 EP K 240 DF K 272 HD K 271 K 601 K 140 Cardan K-400 LP K-401 K-500

  What are the mods you applied?

  Nice to see appreciation for the K270 Playback. Out of curiosity, what are the differences between the K270 Playback and the K270 Studio soundwise?

  It has a big bold sound, but still refined. Where my tube amp is more of a raw power kind, the NUforce is a lot smoother. It feeds my power hungry headphones like the ZMF and Sextett with the right amount of juice, both  in quantity and quality. Of course it doens't change the sound of the...

  I'm using the 1/4, just one unit.....

The NUforce HA-200 is now on Massdrop for a very nice price. It drives my ZMF with ease.

What is the best way to clean those SHR1540 ear pads?

  Sorry, I was misguided by the term 'vintage'.......