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Which tubes to roll

I just picked up a Cary CAD 120S. I wasn't planning on rolling tubes so soon but one output tube was missing so I've started looking into it.

Right now it has KT88EHs as the power output tubes. I was thinking about trying some different ones, say, the SEDs but I was wondering - which tube have more of an effect on the output: the the input 6NS7s or the KT88s?

I noticed on Ebay they have a matched octet of winged-c SEDs for $400 that are supposed to be the original Svetlanas.
wireless200

Showing 2 responses by wireless200

wireless200 OP
415 posts
 
Thanks. I noticed in the manual it says that the following tubes can be substituted for the KT88s: 6L6, 6CA7, KT-66, 6550C, KT-90, KT-99 or EL-34.

Just reading another thread and the poster likes the Mullard EL-34s much better than the KT88s. I notice the 34s are less expensive. What, in general, is the difference between tubes that can be substituted for each other?
wireless200 OP
415 posts
 
I found a good website with an explanation of the evolution of the these tube types, the hows, whys, and what-nots.

http://www.jacmusic.com/KT88/kt88.htm
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