2. amps-preamps
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Best tube type for biamping mids and up?

 Hello, I recently purchased a used Cary 120S MK2 for use in a biamp system with Legacy Focus XD speakers. While I’m pretty sure the EH KT88’s it came with will be fine, I started to wonder if any particular tube type lends itself to mids on up. Since each tube type has a different impedance curve, I thought I’d ask if anybody has tried different tube types with a particular tube type/impedance curve in mind for biamping mids on up. 
rabbitholedigger
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mechans
2,999 posts
 
can it take any other output tube other than
KT-88s?
rabbitholedigger OP
4 posts
 
Yes, according to the manual and tech support: 6L6, 6CA7, KT-66, 6550C, KT-90, KT-99, KT-120, EL-34
mechans
2,999 posts
 
Then roll your output tubes I like EL 34s The queen of the midrange !  but get the right type. I have used JJ E34L blue glass for years great mids. (Note that is the name E34L) I have also been very happy with the Gold Lion reissues but they don't make an EL-34 they make a KT-77 which might work.  you could downsize even further to the KT-66 as far as the impedance goes I think its going to be a reiterative process.
rabbitholedigger OP
4 posts
 
Thanks, the previous amp in this slot, a highly modded Dynaco ST-70 has EL34’s, but they were straining to drive the 4x6” mids and 4 AMTs, and it is not setup to do triode, like the Cary is.
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