I've heard many people say the 650 sings on a tube amp, I have never heard them before so I can't confirm. Maybe consider the Little Dot MK2 http://www.amazon.com/Little-Dot-MKII-Headphone-Amplifier/dp/B00A2QMAI2
You will probably find better suggestions here in this thread though:
http://www.head-fi.org/t/197776/sennheiser-hd650-appreciation-thread
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