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In Reply to: Understood posted by KurtP on March 25, 2007 at 20:08:44:
Kurt, you might want to use larger value resistors in series with the grids, that way at lower volume levels the source will see an easier load to drive. The availability of the ecc99 is a nice factor, allthough I have heard the section to section matching can be a little off. The last pair I bought (for the raven) were section matched, costs an additional $4. Compared to the 12bh7, the ecc99 has a much lower rp, making it a better choice for driving tough loads. Having said that, my first version of the raven will probably use 12bh7, as I have a few nos. Nice thing about diy is I can try it and change what I don't like. I have built the power supply as a separate unit with the idea of changing the actual linestage itself.
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