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845 Tube vs KT90

Thinking about auditioning/purchasing a 845 mono block, may cost me big money, so i'd like a few ideas on what to expect from the 845 tube image.
I have a Jadis OR with KT90 and really offers me pretty much what i love in my classical music, each orch section is heard distinctly from the others, IOW the sound stage has presence. However I've heard such wonderful comments about the "king of all tubes" the 845.
I'm wondering though, will the single 845 tube deliver the same separation of fq's as well as the dynamics of the mids are separate from the highs and lows. I do not like at all the image presented by the KT88 tube, nor the 300B tube for classical. Both from my experience have presented classical/orch as a flat one dimensional sound. A total flop.
For light rock , jazz, blues these tubes seem to be best.
So what should I expect from the 845 on classical, though I realize not every 845 amp will present the same image, inner components quality also play a big role. Just looking for general characteristcs as concerns the separtion of the 3 main fq's/lows/mids/highs.
bartokfan
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bartokfan OP
664 posts
 
Yeah good point. Does 845 fall into the category of the 300B tube amps?
Meaning higher sensitivty speakers suits the 845 better than say a lower sensitivity?
I have the Thor a MTM with SEas drivers. Like 88db, the JOR does OK, but would like something more in my music, presence. Don't we all?
Anyway I have intentions of getting the Tyler Woodmere 2's...one day.... So that may be part of the equation. I think they are like the Thor's 88db..?? I do not want roll offs in the low and high fq's as was my experience of both the KT88 and 300B tube amps.
Q: should I stick with what i already know I like? The KT90 sound. But maybe upgrade to a larger KT90 amp? Which would be the Jadis DA60 (or mono blocks with 90's, as I'm looking at a nice preamp i really want).
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bartokfan OP
664 posts
 
I just googled here "845" and see the old topic "Tube fever, 845 set amps"
I read where EJLIU posted on 1-14-06 "most 845 SET 40 watt amps do not do well on low impedance speakers". So like the 300B tube, the speaker must work around the 845amp.
In my game speakers come first, the tube amp has to work for the speaker.
Besides the Cayin monos have a single 300B tube with the driver 845 tube on each chassis, that alone should raise a red flag, in that the speaker must have good sensitivity for the 845.
warrenh's avatar
warrenh
2,299 posts
 
I'm a jazzman, but do Mozart, Vivaldi and their friends quite often. I'm driving 101db speakers with 40 SET wpc. My speakers never drop below 6 ohms. I get all I need from the Brandenburg Concertos to Stravinsky's (some serious SPL) Firebird. I cannot imagine stella satisfaction with an 845 tube with 88db speakers. I would always be yearning for more when playing big symphony music. I would think in terms of more sensitive speakers, then hook up with an SET tube 845 amp/pre. It works for me.
warren
bartokfan OP
664 posts
 
Still looking for a solid opinion on the general character of the 845 vs the KT90 on classical.
As I say i'm very happy with the JOR but having read all the comments on the magic of the 845 I'd like to know if this would bring another dimension to classical.
If the 845 is brother to the 300B then it aon't gonna happen. Classical, orchestral I'm refering to, totally overwhelms the cababilities of the 300 tube. Even most KT88 amps I've heard have difficulities with orchestral. Have not heard the EL34's. The KT90 may be the ideal tube for orchestra.
Thoughts?
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