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In Reply to: Re: What are you driving? posted by KurtP on March 24, 2007 at 20:39:27:
Kurt, I have used these amps with several different speakers with sensitivity ranges from 88 to 95 db. I don't listen super loud, these amps in either version have had no trouble with any speaker I have used. If I were planning a three stage amp, I would use Kevin's design. The 300b may get a future rework in this direction. I am driving my amps at present with a 12bh7 srpp line stage. It has no problems driving them, but I am building a transformer coupled line stage now (working on power supply today). My only concern with the Raven is it is virtually identical to the input stage of the amity, and as such would appear to have the same issues with source impedance, although I would plan to add series resistance in the grid circuit to allow for a shunt gain control. I am also a little squeemish about back to back stages using the same tube. Some have reported the ecc99 to be a little harsh sounding. My amp isn't, but it is also being driven by the 12bh7 stage.
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