Retubing CJ 140 amp

The output tubes in the 140 are Svetlana 6550's, not Sovteks. I have aksed Lew Johnson this.
I have just changed my tubes to EH KT88. Differences in my system is a slightly tighter bass and perhaps a little more treble extension, which is what I was looking for. mid's are similar.

cheers Shane

I should clarify. I do not have the prem140. I have the prem8a monoblocks.
Just wanted to clear that up before i send someone down the garden path.
Lew at cj did not recommend going to the KT88's, but I think that is more from a realibility standpoint. he indicated that in prem 8a at least the adjusting the bias for 6550 and Kt88 was the same.
Not sure if I can afford going to monoblock 140's anymore. I am going to have a listen to the ACT2 pre amp in a few weeks. The prem 16 is starting to show its age, with a Hovland HP200 sound more transparent and a tighter bass.

cheers

cheers