Consonance Cyber 800/845 Valve amps; how good?

Could be, I certainly do not have the competencies to say yes or no, but this stuff is from a country with little respect for intellectual property including of it own internal products. Even if they are fakes, they may be good fakes. Perhaps Rubycon were they to have no record of sales to this company would know. I am kind of sorry that I brought this up as it cannot be resolved.

I am still quite happy with the 211 version of these amps with NOS tubes and improved wiring.

I own the Cyber 211s, which I bought after hearing both the 845s and 211s. They are a good value for the money. Recently I had the input wire changed to quality wire and had the metal oxide resistor changed to metal film. These changes took them even further than had the RCA 211 tubes and other NOS 5687s and 6922s. They also benefit greatly from isolation.

Workmenship within is good but parts are just okay, if they are real rather than copies. I do like the bass on these amps and how quiet they are. It really surprises me that these 211s are so quiet.

I do not know whether the caps are really made by the company whose name is on them. Few Chinese products use parts other than those made in China and are often forgeries.

Rubycon.

Peter, have you compared 845s and 211s? I had always heard that 845s were better but that the tubes were largely unobtainable as NOS. I heard the Cyber 845s and 211s compared and really heard little to convince me either way. Now that I have the 211s and have heard the benefits of NOS in the amps, I am happy with my decision. RCA 211s are in my experience clearly the superior tubes and one can still find them.

I agree with you about the WE300B tube. I must say that only pre-1980 Western Electric tubes can satisfy me. Until I heard the Reimyo PAT777 300B amp, I was convinced that the tube was good only for midrange. Now with 92 db speakers, the Reimyo just does not have enough power for my use. Obviously the Reimyo while excellent is very expensive.

Peter, I really don't know the make of the wire in the Cyber series, but while my amps were being repaired (a bad 211 had taken out two resistors and a cap), Exemplar found very poor wire from the inputs to the boards. They also found a metal oxide resistor. They replace both giving a very substantial improvement.

I don't deny that these were quite good sounding amps prior to these changes. I also have the Reimyo PAT777 300B amp using '60s" WE 300Bs. The Cybers are not in this league but do have more control and better bass and dynamics, which may be the result of my using 93db efficient speakers.

My comments about the Rubycon caps, center only on the possibility that they may be fakes. After all these are made in China, which has no control over intellectual properties.