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Re: Low vs High Operating Points

I forgot to ask a question. How much power do you want? The thing about less voltage and less current is you get low Wattage out. I was thinking of drivers where I go for max swing and about 80% of the heater current capacity of the tube. For the 300B, I would go for the linear portion of the curve at 75-80mA, where I think you can do 450V ( which gives 34-36W of dissipation on the plate, which is safe and gets the max power. just looked at the curves, whoa! what a linear tube!) You can always drop down, but design to drive the worst speaker load. Also, if you use the Russian 300B, which is the same as their 2A3 evidently, it is a current pig and low current gives lean bass. However, the tubes will not last as long as they would if you dropped the current and ran them at 450V and 60mA(which makes sense for the expensive 300B's).


http://datasheets.electron-tube.net/sheets/163/3/300B.pdf

Personally, I am always running out of power... and gain...

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