Hello, this unit about 5 months old and used maybe 50 hours because I have other amplifier, amp almost new and looks like new , working flawlessly and sound real good , powerful enough to run any headphones I have original package The Cayin HA-300MK2 is a fabulous sounding 300B SET flagship headphone amplifier. It has that classic slightly sweet or euphonic coloration combined with a seriously impressive holographic staging quality. Neither does it lack power for demanding headphones so dynamic range is never going to be an issue.

For sale is a beautiful Cayin CS-55A Tube Valve Amplifier in silver. The amp has an included (excellent quality) moving magnet phono stage and DAC, and comes with both the original Cayin KT88 and an additional set of Harma Retro EL34 valves. Additionally, there are a nearly new set of Electro Harmonix 12AX7 (ECC83) (which replaced the original JJs when one went bad), a lightly used set of Brimar CV4003 12AU7 (ECC82), and the orignal set of JJ ECC82s which are still working perfectly.The EH, Brimar and Harma valves were all purchased by me last year and have all been very lightly used and work 100%. I went back and forth between the KT88 and EL34, preferring the KT88 for rock and the EL34 for Jazz, but in the end Im not using the amp enough to justify keeping it. Nearly all my listening is now done on headphones so Im downsizing to a cheaper integrated and posher stand alone headphone amp.That being said, the biggest surprise for me with this amp is how good the headphone section is and I did most of my listening this way with a pair of Sennheiser HD650 which is a wonderful match. The original fully working remote, manual and USB driver CD is included along with the original box, and everything is in fantastic condition - Ive treated this very very carefully and really looked after it.This amp is only rated at 40W and 38W for KT88 and EL34 respectively, but it drove my Spendor 4/5s beautifully and was never wanting for power with either valve set. It gives a giant soundstage with holographic imaging, and has incredible clarity and sound quality across the frequency range. For a good review, look for Thomas & Stereo on YouTube who goes into detail about how good this amp is. You are welcome to collect in person and hear it working, but I will also post by insured courier as the included box and packaging is very strong. Check my feedback and buy with confidence, I list my items accurately and honestly and am always happy to answer any questions.UK bidders and shipping only, and all offers through the eBay offer process please. Thanks for looking.