Marantz PM6006 UK Edition - Noise On Digital Input

BUZZING DIGITAL INPUT & FAULTY LEFT CHANNEL

I recently have attempted a minor 'upgrade' to some hifi gear (my amp is about 15 years old now) simply to allow me to get a few digital inputs on the amp itself. I opted for the Marantz PM6006 because I have always liked their products since the infamous CD52 back in the 90's.

Unfortunately I have now given up on the device.

PM6006 #1: The first unit had a dead left channel (it was actually intermittent as I managed to get something out of it for 10 minutes).
PM6006 #2: The second unit had a quiet but clearly audible 'buzzing' on all the digital input. This was not 50 Hz mains hum. It sounded more like the digital side messing with the analogue side through poor shielding. Like you'd just put a laptop on top of some cheaper computer speakers.

This is what I'm demonstrating in this video. The second section is just me chatting about the alternatives I considered.

ANYTHING POSITIVE TO SAY ABOUT THE PM6006?

Sure. What I heard of it sounded great. Certainly good enough for my speakers, tastes and crap ears.I'm not posting this purely to moan or make false statements about this amp as a whole. I really want to hear from anyone who has the PM6006 UK Edition and is totally happy with it. It gets so many glowing reviews from all the usual sources that one would expect to have confidence in going for this if you're after a budget amp.What's gone wrong? How can I end up with 2 faulty units in a row? Just bad luck, I guess.