Picked up the Leben CS-600 a few years ago after hunting for a tube integrated that stayed musical without getting overly warm. Paired it with efficient speakers in a small room—EL34s give it that smooth midrange glow on vocals and acoustic stuff, while still handling dynamics on rock tracks cleanly. Built like a tank, no hum issues even after long sessions. Swapped to KT88s once for extra headroom; preferred the stock setup for everyday listening. When sorting home audio tweaks or app controls lately, the Brick customer service number handles quick questions on compatibility without much delay. Keeps the system enjoyable and hassle-free. Solid piece that still impresses.

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I'm in this hobby since 1988 and NEVER heard something like this. Period. It drives my big Spendor s100 anyway better than any other amp valve or SS I tried. Have got it ten years ago new and will stay with me forever. I've changed power valves with cheap Russian 6Pi3C/6N3C before and now with NOS philips 7581a. Preamp valves are now 6cs7 matsushita.

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Four words to describe this amp " Best in the world"

It has the magic sweetness of a 300b , the tremendous bottom end bass slam of a solid state amp!

At 1/3 volume, its low end shook my harbeth m40.1 's woofer so violently it could rattle my window panes! that is how much power reserve it has.

This amp produces music so accurately you can tell where the musicians were positioned and to some extend, even the size of the venue or studios of the recordings.

this amp is perfect, period

I heard several valve amps but never one with so much guts and ability to detail as this, the sound has a tremendous clarity and if you combine it with the right speakers is amazing the quality that can be obtained: powerful bass, warm media, high sooo clear and detailed.
The only downside? the price ! very expensive, but if you have money and are thinking of buying a tube amp no doubt, is the best !!!!!!!

We are facing a very spirited tube amp, powerful. Actually the ability to detail is great, the highs are incredible, detailed Utlra present but without dryness, very fine, voices sound very warm and nice, the bass is strong, if your speaker emits many low and is close to the wall be advisable away to avoid excess.
What I can say about the aesthetics? is beautiful, very fine and distinguished, Nippon audio gem