K&K Audio / Lundahl Transformers

Input impedance

72.131.105.61

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I actually had increased the value somewhat, based on Kevin's recommendations. I surmised 5K at zero output would be okay, since I'm not hearing anything anyway. At low volumes, I arrive at my 10K target fairly quickly. From there, I was more concerned about putting in too high an ohmic value pot, for high frequency rolloff and noise.

Most commercial CD/DVD players should have no problem driving a 10K load, I thought. Or, would it be better in the long run to increase pot value or decrease turns ratio?

I would probably agree with you that a 12bh7 would be sufficient for the preamp stage, and the ECC99 would be a better fit for the driver of the output tubes (or 45 if a three stage amp).

So you are building a Raven? Was your prior post just saying to avoid redundant stages with the same tube, but to still use a pre?

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