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RE: No this is not an comersial product

There are lots of good pentodes to use *AS* pentodes. The lower gm and plate dissipation of the small, nominally 'signal' ones require a fairly high value plate load resistor to deliver adequate gain. When working into the grid of a power triode, it is not only the Miller of the voltage amp, and its loading from the volume pot, but the Miller-amplified capacitance of the final you'll have to worry about.

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

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