Typically you want the input impedance of your amp to be more than 10 times the output impedance of the preamp for optimal performance. The input impedance of your amp is 10 kOhms so as long as the preamp is below 1k Ohms (as many are) it should be fine unless your amp is different from almost any other solid state amp. I’d shoot Krell a call just to make sure, but I highly doubt it’d be a problem to use a tube preamp. As mentioned above, many people here use a tube pre with a solid state amp with no problem and wonderful results.
Vacuum Tube preamp with my KRELL KAV 250a, a no no......WHY?
I have an older Krell KAV amp that has been recapped and refreshed. A technician that I respect very much said do NOT use a vacuum tube preamp with my KAV 250, or any other Krell amp for that matter. Can someone with more technical knowledge than myself tell me why I should not be using a vacuum tube preamp with my Krell? Are there some technical specs that I should be aware of when pairing?
Thanks