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DC Vs AC filaments aside ...

I don't buy the argument that filament voltage should be a primary reason for choosing one tube over another. Asymmetry has long been touted as being much more detrimental in tubes with high voltage filaments, say an 845 with 10V Vs a 2A3 with only 2.5V.

However there's more to it than that, eg under typical operating conditions the RATIO of input signal compared to voltage drop across the filament is not that much different between a 2A3 an 845 despite the four fold difference in filament voltage.

Another case of taking one small piece of the puzzle and drawing a conclusion as to what the big picture looks like.

Naz


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  • DC Vs AC filaments aside ... - Naz 00:20:10 05/29/12 (0)

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