Alternative air pumps for ET2

The guy who bought my extremely cranky and unreliable ET-2 back in the mid-90s ascribed its difficulties to the Wisa pump that had come with it (purchased used by me). Said this happened all the time and that he bought them cheap and discarded the pumps. He told me this AFTER he had bought mine. An earlier ET-2 that I had owned, with the stock pump, operated perfectly. Dave

I've used a 2.5 hp air compressor for years with a 10 gallon air tank. since it makes a bit of noise, it is located in my garage within a make-shift sound proof crate. At the TT end, I have a lab-grade regulator that works very well.

My reason for asking is that I recently saw a short blurb by someone using a Medo AC0110 airpump so I ordered one. The day it came in I hooked it up and tried it at 5psi (over the 3 of the original) and really liked the sound. However upon further checking I saw that it is rated at a 30 min duty cycle and gets really hot! Bruce Thigpen also suggested the Medo air pump. I am a little concerned about the heat as I need to build an enclosure due to the noise.
Dopogue, you have me concerned also that maybe I'm compromising the reliability of my 10 year old arm, which has performed very well. I hope the added pressure doesn't screw it up!
Thanks for your replies,
Cheers