Hello,
I have a 400cx and it does make that thermal expansion sound - almost like pinging the heat sink with a small mallet. I talked to Krell a service tech who told me essentially the same thing he told you, thatÂ’s "normal" operation. He also told me that they had a fix; send the amp back to them and they apply some kind of tape to the heat sinks. I don't know how effective this is. He did not mention tightening the heat sink bolts.
I decided to live with the occasional ping as opposed to shipping 110 pounds of amp across the country.
If the sound really bothers you could contact your importer or Krell directly to find out more about this fix.
Bob R.
I have a 400cx and it does make that thermal expansion sound - almost like pinging the heat sink with a small mallet. I talked to Krell a service tech who told me essentially the same thing he told you, thatÂ’s "normal" operation. He also told me that they had a fix; send the amp back to them and they apply some kind of tape to the heat sinks. I don't know how effective this is. He did not mention tightening the heat sink bolts.
I decided to live with the occasional ping as opposed to shipping 110 pounds of amp across the country.
If the sound really bothers you could contact your importer or Krell directly to find out more about this fix.
Bob R.