Hi ilmenator,
of course! The long story… 
GAS helped me to an E-MU Ultra - it was all broken up, the previous owner let it falll on the floor or something, anyways, the acrylics section (with the label E-6400 Ultra) was missing… that’s why it was very cheap… and I had to have it
Well, with the saved money, and because I really began to love it’s user interface and its possibilities, I began to mod it a bit:
a) added an Artronik 240x64px display with a white LED backlight. The contrast regulation did not work properly at first, so a small manual contrast regulator (potentiometer) had to be installed (but this was in the schems), so no problem. Afterwards, it was possible to get rid of the annoying el-foil high voltage generator…
b) removed the noisy 40x40mm fan and added a silent 80x80 fan, that is driven by only 7 volts (12V and 5V lines = 7V differential). It was silent on 12v already, and at 7v it is inaudible, but there is a bit of airflow over the internal PSU, that should be sufficient…
c) added a 120GB SATA SSD, that is converted to IDE with a SATA->IDE converter. The disk is formatted to FAT and has a quick-eject frame, so you can prepare samples on a PC and easily transfer lots of them to the E-MU.
d) as the front-window was broken up, and it looked very messy, I did not know what to do with the “open space”. By accident, i stumbled upon the DSO 138 DIY oscilloscope kit, which can be bought for around 17$ (incl. shipping) from china :-). It was a fun afternoon session to solder - it can be “preset” to audio waveform levels, so no adjustment is necessary, every time the unit is powered up… It is internally connected to the headphone output (which is still available) and to 5V/GND. The display has been separated from the main PCB, to allow installation in the available area… Now, only a 50% black smoked replacement window (covering both displays, they are bright enough) needs to be ordered from Ponoko, and I am a happy parker with a probably quite unique e6400 :-).
By the way, if you also have an Ultra or any similar sampler from that era, the “adventurekid single-cycle waveforms” are just plain awesome:
http://www.adventurekid.se/akrt/waveforms/adventure-kid-waveforms/
For example on the E-MU, you could build a 64-oscillator monosynth or an 8 voice 8-oscillator poly using these waveforms. Many of them come from traditional synths (or from 8-bit soundchips / arcade machines), and there are many more synthetic waveforms. They sound just awesome! 
Many greets and have a great time!
Peter