I am looking to purchase a high speed, high capacity centrifuge with refrigeration for recombinant protein E.Coli work. I would prefer the ability to do 6L at once (6x1L) at >15,000xg and 50 mL tubes at > 20,000xg. So this basically comes down to two centrifuges, I think:
Beckman Avanti J-26 XPI
Thermo Sorvall Evolution RC
I was going to go with the Avanti J26 XPI, since I have used one previously and liked it. Also, almost everyone I know has Beckman centrifuges (and have had them for decades). However, the Thermo people stopped by and made me think about a few things. These were their major points:
#1 Thermo's new carbon fiber rotors are superior and have a full 15 yr warranty. They brought up the fact that the Beckman JLA-8.1000 rotor has a finite lifetime because of how it is constructed, scary for a $16,900 rotor since its warranty is a prorated 7yr one.
#2 Thermo has a buy 2 get one free promotion on the rotors right now
#3 The Sorval RC series runs at atmosphere which has several advantages over the vacuum system that Beckman uses on their Avanti series to achieve high speeds.
I am still waiting for a quote from Thermo, but I am guessing that it will be ballpark with Beckman (~35K with 2 rotors). I have not talked to the Beckman rep again to see her counter arguments.
So I would like to see if anyone has any good suggestions or recommendations for the best high speed/performance centrifuge for me (that will hopefully last forever).