Preamp Recommendation


Hi 
I have just purchased Classe CTM-600 Mono blocks. They are currently running with an old ML 38s. I have tried using a VTL 6.5 III but had a hum problem. Tried everything but could not get rid of the hum. The 6.5 was not new so the pre it self could have had problems. 
I have an option to buy an Ayre KX-R at a great price. Question is will the Ayre a significant upgrade on the ML? Speakers are B&W 800 D. Sources include Clear Audio TT and a PS Audio Directstream Junior. 
Thanks
srafi
If the Classe has a balanced input, I would take advantage of it. BTW there are balanced line tube preamps.

Also, do be careful with that Classe. Some of the output devices have gotten hard to find.
You did not mention price , SS or Tube  preamp.

Myself recently just got away from main stresm commercially made. I decided to try a Direct Heated Triode preamp 
Using premium everything ,4 pole power capacities Lundahl transformer based with multiple filter chokes. NEOTECH 0 crystal 
Wire. The sonic purity is outstanding. 
This is exactly why I custom build. Using high-end parts for much better sonics.😎 nice to hear someone else has broken away from the norm!👍
Parts Connexion has a 25% off sale this weekend, and free shipping over $100.