They mainly do tubes. Why do they have to build on something that is this good?
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Why does a company discontinue a product? In some cases because a new design exclipses the old design, or it just didn't sell well in the first place. I can't answer this for sure in the case of the Cary CAD-500MB, but it could very well be because it didn't sell well. So, if that was the case, why would they build on it with a 600MB, 1000MB, etc? With that said, when I sold Cary products, I really liked the CAD-500MB. They were very good monoblocks.
Perhaps the two-channel audiophile wasn't convinced that a primarily tube manufacturer could make a good solid-state amp (which would have been a mistake), and perhaps the home theatre buyers didn't want stacks of monoblocks to run their setup. Just guesses.
Is this its replacement?
The new Model 1.600 is a mono power amplifier rated at 600 watts into an 8 ohm load. With a 1500VA universal voltage dual primary transformer, there are four independent power supplies within the Model 1.600, one for each rail of each amplifier channel. The power supply also incorporates inrush current limiting that is switched out after a short time period once the amplifier has been powered on. This allows the amplifier to not cause brown outs when switched on, but pull the high currents necessary for proper performance when in operation. On the audio input section, the Model 1.600 utilizes the THAT Corporation 1200-Series In-Genius high-CMRR (Common Mode Rejection Ratio) input stage which feeds the new National Semiconductor LME49811 High Fidelity Power Amplifier Input Stage. The LME49811 chip drives the final, balanced bias circuit and a triple output stage yielding an unprecedented low noise level, superb balance, and extraordinary power levels.
"Perhaps the two-channel audiophile wasn't convinced that a primarily tube manufacturer could make a good solid-state amp (which would have been a mistake)...."
Conrad Johnson I believe may have gone thru a similar situation with the CJ Premier 350 amplifier. Some feel at the time this was the finest amp ever produced by CJ. Was it dropped due to a stigma attached by being produced by a mfr that produces tube audio gear products or due to cost? Some have reported the latter is the real culprit but I wonder.