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For the past 3 months I've been looking for a suitable tube preamp for my 400cx. The only concern that you MUST lookout for is, DC leakage. DC can leak from tube preamps. It is damaging to Krell amps. You can also move the jumpers on the digital board inside the Krell for protection from DC. Krell will give you the instructions if you contact the service guys. I have elected not to move the jumpers, but find a preamp which doesn't leak DC. A much more challenging situation I must say. Moving the jumpers will change the sound of the Krell. There are several tube Preamps which do not leak DC. However I've never checked into CJ. Good luck. I know how you feel.
pt
For the past 3 months I've been looking for a suitable tube preamp for my 400cx. The only concern that you MUST lookout for is, DC leakage. DC can leak from tube preamps. It is damaging to Krell amps. You can also move the jumpers on the digital board inside the Krell for protection from DC. Krell will give you the instructions if you contact the service guys. I have elected not to move the jumpers, but find a preamp which doesn't leak DC. A much more challenging situation I must say. Moving the jumpers will change the sound of the Krell. There are several tube Preamps which do not leak DC. However I've never checked into CJ. Good luck. I know how you feel.
pt