Is there anyone replaced the 6550 in the Ref5 or Ref3 or Ref cd8 for a KT88. I have a few nos GEC kt 88 from the fifties and the sixties. I replaced one in my Ref cd8 a few months ago and in my opinion it has more detail, finer, opener and smoother.
Do not do it. 6550 should be the only tube used in the Ref 5 and Ref 3. Make sure you get a 6550 that has been tested becuase you will hear it if it's noisy.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.