I talked to ARC today 3/9/11, sorry I forgot the name, but ARC is now strongly recomending that even current products like my Ref 210s be sent back for some power supply adjustments before going with the K120 tubes. He said they have learned more about the K120.
BTW I did not go into any detail since I was calling about another 6550 tube issue and I have 650 hours on my set so I will not be making the jump soon. My issue is a 6550 driver tube that will not hold bias.
I am looking forward to the K120 for hopefully both sonic improvements and reliability improvements over the SED 6550 - but its not like they dont sound good IMO.
Terry
BTW I did not go into any detail since I was calling about another 6550 tube issue and I have 650 hours on my set so I will not be making the jump soon. My issue is a 6550 driver tube that will not hold bias.
I am looking forward to the K120 for hopefully both sonic improvements and reliability improvements over the SED 6550 - but its not like they dont sound good IMO.
Terry