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In Reply to: RE: You did not address my question posted by Tre' on August 12, 2009 at 10:36:41
Yours is an honest question-- and I understand why you ask it.
All I will tell you is that the highs in this design are superior-- to almost any amp out there.
With that said, I know that SOME highs ARE being lost driving that input capacitance, but it's not nearly as bad as you think.
I think that more highs are lost in conventional power supplies, conventional layout, and especially conventional wiring than are being lost here.
I would also caution that one need not design for more highs than are actually needed to accurately reproduce recorded music.
I have found that the bandwidth of the supporting power supply for this kind of driver is a large factor in overall performance. Remember also, that I stress light loading for voltage amps.
This light loading allows the use of high cathode resistances, and even higher grid-to-ground reference values.
This allows the use of small capacitances-- especially in cathode circuits (an example is that a conventional amp may use a Blackgate 100 uf cap to bypass a cathode-- (I can't stand to listen to that-- any highs present are mostly distortion)-- I might use a 1.5 or 2 uf. BIG BUCK ($)cap. I'll typically look at 4 or 5 HZ on one stage, and maybe 8 HZ or so, on another stage-- as cathode low-end points.
I AM losing highs in one place. Conventional amps are losing highs everywhere.
---Dennis---
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