I haven't heard them but the CT5 uses the 6N30P (aka 6H30P) tube while the CT6 uses the 6922. This could result in a significantly different sound but not necessarily.
There should be some reviews around that might compare them.
I want to hear from the owners. I have already read the reviews. Br3098, I found it interesting the CJ released both the CT-5 & CT-6 in late 2005 in accordance with the company's website.
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