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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Re: Driver Impedence and Interstage Questions posted by Horn-a-copia on August 4, 2003 at 07:40:33:
In the case of the P-P to SE IT, the grid of the output tubes "sees" the plate-to-plate impedance divided by the square of the turns ratio. So the grid sees roughly 2 x Rp x 0.25.The driver tube(s) "sees" the grid impedance, which at low frequencies is predominantly the reactive impedance of the IT secondary and at high frequencies is the parallel sum of this and the reactive impedance of the output tube grid capacitance.
As I wrote in the first post (almost), the advantages of Class A P-P to SE IT drive (compared to the same two tubes used in parallel SE) that are apparent to me are: for a given size of transformer, a lower low frequency response limit, lower even order harmonic distortion, and half the drive impedance for the same driver tube bias point.
With the caveat of little or no thought given to the frequency response consequences of my choice, you could try something similar to connection Alternative N with the secondaries wired up to give 2.25+2.25:2.
Kevin Carter
K&K Audio
www.kandkaudio.com
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Follow Ups
- Re: Driver Impedence and Interstage Questions - KevinC 07:33:55 08/05/03 (0)
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